Many
people wonder why some men want to live on the moon. {{U}} {{U}} 1
{{/U}} {{/U}}It is a silent place, where the weather is hot and sunny or cold
and dark. Its surface is dull and almost colorless. There are no lakes, rivers,
or plants to provide beauty. {{U}} {{U}} 2 {{/U}}
{{/U}}Astronauts on the moon certainly miss the comfort of life on the earth. But
man has always moved to new frontiers. Every pioneer in a new land has faced
danger and hardship. Some scientists hope that continued work
will be done on the moon. Many experiments will be done there more easily.
{{U}} {{U}} 3 {{/U}} {{/U}}Matter can be heated to very high
temperatures without chemical change when it is in a vacuum. Air, dust and
clouds cannot block human being's view of space from the mood. 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 launch
spacecraft. Man might be able to learn much about his own body
by living on the moon. {{U}} {{U}} 4 {{/U}} {{/U}}Man would be
in control of the community of life in which he lives. Bacteria could be removed
from the air in this community. Gravity is one thing that would
not be under human being's control. Some scientists believe the low gravity of
the moon would be healthful 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. {{U}}
{{U}} 5 {{/U}} {{/U}}Much exercise would probably be needed to keep
the body in good condition. A．He would be living in a habitat
that he made for himself. B．However, the human body might
change during long stays on the moon. C．But man cannot live
there happily and comfortably. D．It is probably not the kind of
place where most men would choose to live. E．A simple walk on
the moon's surface is filled with danger. F．Some large
experiments are very easy to do in a vacuum.