1, can't I drink water that has been boiled repeatedly?

You can drink. Some people think that excessive nitrite will cause cancer if water is boiled repeatedly. In fact, although water does produce some nitrite after several times of heating, laboratory data show that the nitrite content of tap water is still far below the standard of good drinking water after several times of boiling. Don't worry about "nitrogen poisoning" and "carcinogenesis".

2. Does too much water increase the burden on the kidneys?

On the contrary, as long as the renal function and cardiac function are normal, encourage drinking more water. Drinking water is to replenish water. Everyone's physical needs and amount of exercise are different. You can drink 1.5 to 2 liters of water every day according to your own situation, and the urine color is bright yellow. Drinking more water can improve constipation, reduce uric acid, and the climate in winter is dry. Water can also moisten the mouth and throat.

3. Should the leftover food be cooled and put in the refrigerator?

Compared with "putting hot dishes directly in the refrigerator", when the temperature drops to the same temperature, bacteria will produce more bacteria in food. If it is stored in the refrigerator for a short time, the increased bacteria are still within the acceptable range. However, it is recommended to wrap the food directly in the refrigerator with plastic wrap, and don't wait until it is cold. This will increase the number of bacteria, but it will only increase the motivation.

4. Can plastic packaging be heated?

There are several types of plastic wrap, some of which can only be used to package foods at low or normal temperature, and some of which have better performance and can withstand the high temperature of microwave heating. Please check the "Temperature Tolerance" and "Scope of Application" on the package. As long as the plastic package is marked with "microwave heating", please feel free to use it.

5. Can't you eat eggs when you have a fever?

You can eat. It is rumored that eggs with high protein content will increase the body's heat when they have a fever, which is not conducive to the recovery of the disease. At present, there is no research to prove this statement. After eating, different foods will bring different calories to the body. But the extra calories from eating one or two eggs have little effect on body temperature.

6. Can red wine soften the cardiovascular system?

You can't. Many people think it can soften blood vessels, because red wine contains resveratrol and other ingredients. In fact, the content of resveratrol in red wine is not high, and drinking a little every day has no effect on oxidation and arteriosclerosis. The alcohol content of 12% to 15% in red wine can not be ignored. Many authorities, including the World Health Organization (WHO), explicitly oppose the use of alcohol to protect blood vessels or the heart.

2. Life tips multiple-choice questions 10.

First, single choice

1. Eating ice cream does not quench your thirst mainly because it: a. contains protein; b. contains fat; c. contains sugar.

2. Which of the following is the hematopoietic organ of human body? A. Heart B. Bone marrow C. Kidney

3. Which of the following ball games has no offside rule? A football b basketball c ice hockey

4. How many children does China Railway Department require to buy a full ticket? a . 1.20 b . 1.30 c . 1.40

5. The word "stepping stone" comes from: A. Examination B. Apprentice C. Being an official.

6. The following statement about pruning flowers and trees is incorrect ()

Cut off the tops of some new branches.

Cut off dead branches, weak leaves and some branches that are too dense.

Cut off the long part of the main root.

Remove adventitious buds from flowers and trees

Second, multiple-choice questions (15 small questions, 2 points for each question, a total of 30 points)

1, prevention of intestinal diseases should be done ()

Exercise once and eliminate the four evils.

B don't drink raw water, don't eat spoiled food, and wash raw fruits and vegetables.

Pay attention to the disinfection of bowls and chopsticks.

Try not to go to public toilets.

2. Diseases transmitted by rats are ()

A plague b epidemic hemorrhagic fever c malaria d leptospirosis

3, mosquito-borne diseases are ()

A epidemic cerebrospinal meningitis b Japanese encephalitis c malaria d all three can be used.

4, flies spread diseases are ()

A dysentery b enteritis c cold d hepatitis

5, prevent colds ()

A exercise to enhance resistance B often open the window for ventilation.

C increase or decrease clothes with climate change D don't go to the sick room, and go to public places less when a cold is prevalent.

6, prevent fracture ()

Pay attention to traffic rules to prevent traffic accidents. B pay attention to safety when going up and down stairs or working high above the ground.

Avoid climbing and taking things to prevent falls and fractures. Patients with osteoporosis should avoid strenuous exercise.

7, heatstroke first aid ()

A In case of mild heatstroke, you should leave the high temperature environment immediately and rest in a ventilated and cool place.

Drink sugar, salt water and refreshing drinks, or take Ren Dan orally.

Quickly cool it physically.

Patients with severe heatstroke should be sent to the hospital immediately for first aid.

8, mental health refers to ()

Stay optimistic and adapt to the social environment. Adjust your body and mind with a healthy lifestyle.

Create good interpersonal relationship D family harmony

9, the role of green plants to protect the environment are ()

A greening beautifies the environment, and B produces oxygen.

C Some plants can absorb pollutants in the environment D and absorb noise to adjust the climate.

10, prevention of myopia to do "three don't watch" ()

A walks, rides a bike, doesn't read, B lies, doesn't read.

C. if the light is too dim or too strong, don't read. If you eat, don't read.

1 1, prevention of infectious diseases should focus on ()

A manages the source of infection, B cuts off the route of transmission, C protects the susceptible population, and D is all right.

12, prevention and first aid of gas poisoning ()

When making a fire at home, you should close the doors and windows. You should always open the window to get some air.

Patients with severe gas poisoning should be sent to hospital immediately for treatment. D when breathing and heartbeat stop, do artificial respiration and chest * * *.

13, prevention of ascariasis should be ()

Wash your hands before and after meals. Don't drink raw water. Raw washed fruits and vegetables. I will be jealous.

14, to prevent electric shock to do ()

A popularize safety knowledge, and B repair household appliances in time when they fail.

C rescuing people who get an electric shock cripples their hands.

D don't shelter from the rain under big trees and empty tall buildings in thunderstorm weather; Don't stand near windows, lights or electrical appliances during a thunderstorm.

15, prevention of rabies after being bitten by a dog should be ()

A goes to the nearest hospital for treatment in time, and B takes rabies vaccine in time.

C inject atropine d for hospitalization observation or inject glucose solution.

1, (BC) 2, (BC) 3, (BC) 4, (BC) 5, (BC)

6. (BC) 7, (BC) 8, (BC) 9, (BC) 10, (BC)

1 1、 12、 13、 14、 15

3. The multiple-choice question 10, which requires common sense of life, is urgent tonight and needs five options.

The "0" in the mathematical symbol of 1 originates from a.

Ancient India B. ancient Greece C.

Ancient Egypt d ancient Rome e.

Shenzhou A2 vinegar will turn white if left for a long time. In order to prevent whitening, the luckiest thing is to add some yellow wine and a little A to the vinegar. Jiang Mo B.

Sugar C. refined salt D.

Monosodium glutamate e brown sugar C3 According to custom, wearing a ring on the middle finger means a. Looking for a partner B.

In love, c stands for single d.

It means divorce, and E means married B4 won the Nobel Prize twice (many times) a. ..

Madame Curie.

Sanger Bardeen

The Han Dynasty was the first emperor to abolish corporal punishment by imperial decree. Emperor Wu of the Han Dynasty II.

Hanchengdi c.hanwendi d

Hanjingdi e is not the first degree of water on C6 tap water meter, which means that the water consumption is a.. 100 kg of water B.

1000 kg of water.

A cubic meter of water E and a kilo of water D7 How many stars are there on the American flag and the Stars and Stripes: A.25b.

30 cs。 Fifty d's

Sixty E55 C8 apples contain a trace element that can enhance memory. Tiewan.

The second inheritance of zinc C, calcium, D, magnesium, E and potassium B9 is A.

Grandparents, grandparents, brothers and sisters B. Brothers and sisters, grandparents, grandparents C.

Brothers and sisters, grandparents, grandparents D grandparents E grandparents, brothers and sisters grandparents C 10 According to legend, the person who could "palm dance" in ancient China was A. Yang Yuhuan B.

Zhao c Shi d

The Story of Diu Sim Lv Hou

4. Questions and answers about common sense of life

People's observation is not innate, but cultivated in learning and exercised in practice.

Especially for those who study natural science, observation is particularly important. We should develop the habit, interest and ability of consciously and carefully observing various natural phenomena from an early age.

Through direct experience, we can accumulate perceptual knowledge of natural phenomena and cultivate the ability and habit of observing things scientifically. For effective observation and better exercise observation, it is necessary to master good observation methods.

① Establish the purpose of observation. When observing a thing, we should be clear about what to observe, how to observe it and what purpose to achieve, so as to focus our attention on the main aspects of things and grasp the essential characteristics of things.

The purpose is to observe the most striking features. Only by purposeful observation can we put forward requirements for our own observation and get a certain depth and breadth of exercise. On the other hand, if you look around and turn a blind eye to things, your observation will not be exercised.

For example, if you want to run a new store, you need to gain some experience in displaying goods in other stores. At this time, you must observe with purpose. Only observation with purpose is effective observation, so as to improve one's observation ability as soon as possible.

② Make an observation plan. Before observation, arrange the contents of observation and make a careful plan.

If you have no plan and no organization when observing, you will get nothing. Therefore, there should be a plan before observation, what to observe first, and what to observe later, step by step and systematically.

The observation plan can be written down or kept in mind. ③ Cultivate a strong interest in observation.

Because of the difference in observation sensitivity, everyone has different interest in observing the same thing and notices different things or different characteristics of the same thing. Therefore, cultivating a strong interest in observation is an important prerequisite for cultivating observation ability.

In order to exercise observation ability, we must cultivate everyone's extensive interests, so as to encourage people to observe with relish. At the same time, we must have a central interest.

With central interest, you will concentrate on in-depth observation of a certain field. Some students like to observe the starry sky, especially the Milky Way, Mars, the moon and so on. They can keep an observation diary for a long time.

This can increase your knowledge and broaden your horizons. Some students are very interested in plants, pay attention to observing the growth process of plants, from sowing to germination to maturity, and make a lot of observation diaries.

Teachers often give guidance and help with necessary knowledge. This not only greatly cultivated students' interest in observation and lasting observation, but also improved their ability to express the whole process of development.

Observing interest can also stimulate students' thirst for knowledge. Children are interested in rocks, running water, wind, rain, frost, snow, dew, electricity, thunder, animals and plants in nature.

After a long time, the interest and habit of observation will be developed. ④ Observe the phenomenon and explore the essence.

Observation is the antenna of thinking. To cultivate students' observation ability, we should be good at concretizing the task of observation and guiding students to explore the essence of things from phenomena and even hidden details. ⑤ A cultured observation method.

Most students lack life experience and independent and systematic observation ability. When they observe things, they often fail to grasp the essence of things, or they are careless, talk in general terms, and even the order of observation is chaotic. A good observer must have the skills to observe things and master the appropriate observation methods.

There are many kinds of observation methods, including: A. Natural observation. Is to observe what exists in nature.

Such as observing the growth of plants in the field or botanical garden; Observe the activities of animals in forests and zoos and so on. Natural observation should pay attention to the selection of observation points and observation objects, make records, and make many in-situ or off-site observations.

B. experimental observation method. Is to observe by doing experiments.

Such as anatomical observation or chemical experiment observation. C. long-term observation method.

It is to observe something or phenomenon systematically for a long time. Such as meteorological observation, astronomical observation and so on.

It is necessary to be patient and careful in making such observations. Once the observation points are determined, they cannot be changed at will. D. comprehensive observation method.

It is to observe all aspects of a thing and have a comprehensive understanding of it. E. regular observation method.

Is to observe a certain thing or phenomenon in a certain period of time. Key observation method.

It is to focus on one point or several aspects of things according to a special purpose and requirement. G. direct observation method.

This is an observation method that observers go deep into reality and do experiments by themselves to obtain first-hand information or direct experience. Indirect observation.

This is an observation method that draws profound conclusions by using the observation results of others. First, comparative observation method.

Compare and observe two or more things. J. Anatomical observation methods.

Divide the observed object into two or more parts for observation. ⑥ Master rich knowledge and experience.

Knowledge, experience and good observation are dialectical unity and mutually causal. On the one hand, good observation is the premise for us to acquire rich knowledge and experience; On the other hand, rich knowledge and experience are important factors for us to improve our observation.

A person's observation is always associated with his existing knowledge and experience. So in the process of observation, we must make full use of our existing knowledge and experience, which is not only conducive to the smooth progress of observation, but also conducive to the continuous improvement of observation.

⑦ Follow the objective laws of perception. Observation and observation are improved in the process of perception.

Because, in order to cultivate observation, we must follow some perceptual rules. In other words, some laws of perception have also become the basic laws of observation.

There are seven main laws of perception: a. Law of intensity. The perceived thing must reach a certain intensity before it can be clearly perceived.

Lightning is easy for most people to perceive because of its high perceptual intensity, but it is difficult to perceive the activities of insects, such as the sound of ants walking. Therefore, in practice, we should appropriately improve the intensity of perceived objects and pay attention to those objects with weak intensity.