从方框中所给的选项中选出能填入空白处的最佳选项补全短文，并回答第5小题。
How much do you learn about the solar system (系统)? The
following passage will tell you.
1. It as well as seven other planets goes around the sun. We call the eight planets and the sun the solar system. The first planet, next to the sun, is Mercury(水星). 2. Venus(金星) is the second planet next to the sun, and our planet, the earth, is the third. 3. Jupiter(木星), Saturn(土星), Neptune(海王星) and Uranus(天王星) are all bigger than the earth, but Venus, Mars and Mercury are smaller than the earth.
Animals, trees and humans can only live on the earth—the other planets in our solar system do not have air or water. 4. We don’t know about it.

()5. Where can you probably find the passage?
A. In a fashion magazine.
B. On a map.
C. In a science book.
D. In a guidebook.

1.C 2.D 3.B 4.A 5.C