1, buy a mouth to breathe! When you get it, you close it. If you can't close it, it means that you are dead and can't buy it.

2. The boiling mouth is dead.

If you put it in water, it will float. Don't buy it. It is dead.

If you find a flower clam with a long tongue, touch it and see if it has been brought back. If not, this clam is dead and can't be eaten. If you can reach back, you can eat it.

5. Don't pick the clam to death, or you will have a stomachache after eating it, or you will be poisoned.

In addition, you can't eat the clams you bought home immediately, so you have to go to the sand first. Put the clams in clean water, add a little salt and leave them for several hours. Clams will slowly spit out sand.