The best title for this passage would ...

单项选择题The best title for this passage would be______.

A．The Atmosphere and Our Environment
B．Research on Radiation
C．Effects of Space Radiation
D．Importance of Protection Against Radiation

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1.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

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2.单项选择题We know from the passage that ______.

A．exposure to even tiny amounts of radiation is fatal
B．the effect of exposure to radiation is slow in coming
C．radiation is avoidable in space exploration
D．astronauts in spacesuits needn' t worry about radiation damage

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3.单项选择题______I'd like to, I can't come.

A．Much though
B．Though much
C．Much as
D．As much

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4.单项选择题______ much advice you give him, he does exactly what he wants.

A．Whatever
B．Whichever
C．What
D．However

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5.单项选择题The hostess welcomed her guests in a ______manner, which made all the people present at ease.

A．spacious
B．suspicious
C．gracious
D．merciful

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6.单项选择题We should make mental preparation for failure, because there is only a(n)______number of possibilities of success.

A．infinite
B．finite
C．innumerable
D．numerous