test center: special topic of space exploration: analysis: satellite launch must reach the first cosmic speed in order to realize revolution around the earth. The lower the latitude, the faster the linear speed of geographical rotation, and the easier it is to reach the first cosmic speed, which can save fuel. A, the materials can't show the original basic conditions and the success rate of launch, and A is wrong; B, the satellite launch must reach the first cosmic speed, in order to realize the revolution around the earth. The lower the latitude, the faster the linear speed of geographical rotation, and it is easier to reach the first cosmic speed, which can save fuel. B is correct; C, sunny weather, light air pollution and high transparency are the advantages of Jiuquan, and C is wrong; D, both places are mainly land road transportation, D is wrong. Therefore, choose B. Comments: This topic mainly examines students' analysis of satellite launch conditions, which is difficult to some extent.