单项选择题


Questions 18～21 are based on the following passage.
To start with, McDonald’s was

A．a snack bar
B．a take-out restaurant
C．a drive-in restaurant
D．a small cafe
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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．radiation is avoidable in space exploration
C．astronauts in spacesuit needn’t worry about radiation damage
D．the effect of exposure to radiation is slow in coming
单项选择题
Which season can strengthen the immune system in animals
A．Spring.
B．Autumn.
C．Winter.
D．Summer.
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