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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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.

单项选择题

A．He usually talks quietly.B．He usually assigns homework.C．He didn’t teach class today.D．He noticed that the students didn’t do their homework..

A．He usually talks quietly.
B．He usually assigns homework.
C．He didn’t teach class today.
D．He noticed that the students didn’t do their homework..