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[参考范文]
Dear Sir:
I am very pleased to write this ref......

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单项选择题
Few airlines want to impose a total ban on their passengers using electronic devices because ______.
A．they have other effective safety measures to fall back on
B．the harmful effect of electromagnetic interference is yet to be proved
C．most passengers refuse to take a plane which bans the use of radio and cassette players
D．they don’t believe there is such a danger as radio interference
单项选择题
It can be inferred from the passage that ______.
A．radiation is not a threat to well-protected space explorers
B．astronauts will have deformed children or grandchildren
C．protection from space radiation is no easy job
D．the Apollo mission was very successful
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