单项选择题

A．reason
B．cause
C．problem
D．purpose
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单项选择题
It can be inferred from the passage that ______.
A．the Apollo mission was very successful
B．protection from space radiation is no easy job
C．astronauts will have deformed children or grandchildren
D．radiation is not a threat to well-protected space explorers
单项选择题
A．sourceB．originC．courseD．finance
A．source
B．origin
C．course
D．finance
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