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.

今年3月15日，十二届全国人大五次会议表决通过了《中华人民共和国民法总则》。这表明法律（　　）

被称为“经济联合国”的世界贸易组织(WTO)，构建了当今世界的多边贸易体制。其前身是1947年成立的关税与贸易总协定，当初成立这一组织是为了

下列图案是轴对称图形的有（    ）

如图所示是实验室制取气体的常用装置，请根据要求回答问题：