根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。
When you look up into the sky on a 1 night, you will see the moon and the 2.
Since ancient times, men 3 wanted to know more about the moon, the stars and other 4 in the sky. They invented telescopes to get a closer look at them and 5 that there are many suns. moons and planets in the sky. They became interested in the 6 .
7 October 4th, 1957, the Space Age began when the first man-made satellite was sent into space 8the earth. Today, scientists are able to 9 on the moon. Man will 10 more places one day.
