单项选择题

The best title for this passage would be ______.

A．Is There Life on Mars
B．They Found Life!
C．Mars, A Dead Planet in the Space
D．Future Colonies on Mars
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单项选择题
Which of the following is closest in meaning to the sentence It was shooting blind.., to look for evidence of life...
A．We were carrying on experiments aimlessly.
B．It was impossible to reach the Mars because of the distance.
C．We could see nothing in the outer space.
D．We didn't believe life really existed on Mars.
单项选择题
The word assumption probably means ______.
A．the adopting of a manner
B．something taken for granted:
C．confidence in oneself
D．scientific reasoning
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