单项选择题

According to the first paragraph, the atmosphere is essential to man in that ______. A) it protects him against the harmful rays from space B ) it provides sufficient light for plant growth C) it supplies the heat necessary for human survival D) it screens off the falling meteors
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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
单项选择题
A．The show is too difficult to understand.B．There is nothing worth seeing there.C．She doesn’t understand what’s on the show.D．The room is too small for the audience.
A．The show is too difficult to understand.
B．There is nothing worth seeing there.
C．She doesn’t understand what’s on the show.
D．The room is too small for the audience.
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