填空题

Many people wonder why some men want to live on the moon. It is (1) not the kind of place where most men would choose to live. But man has always moved to new areas.
Some scientists hope that continued work will be done on the moon. Many experiments will be done there more (2) . Some large (3) are very easy to do in a place without air. Matter can be heated to very high temperatures without (4) change when it is in such a place. Air, dust, and clouds cannot (5) man’s view of space from the moon. The very high or very low temperatures and low gravity on the moon will be used for many experiments. One very important use of the moon will be to (6) spaceship.
Man might be able to learn much about his own body by living on the moon. He would be living in a habitat that he made for himself. Man would be in control of the (7) of life in which he lives. (8) could be removed from the air in this community.
Gravity is the one thing that would not be under man’s control. Some scientists believe the low gravity of the moon would be (9) for man. The heart would not have to work so hard. The body would need less energy to move than it does on the earth. However, the human body might change during long stays on the moon. Much exercise would probably be needed to keep the body in good (10) .
A. community B. condition C. launch D. insight
E. chemical F. mysterious G. experiments H. probably
I. healthful J. easily K. extend L. render
M. promptly N. block O. bacteria