单项选择题

Desert plants ______ two categories according to the way they deal with the problem of surviving drought.

A．break down
B．fall into
C．differ in
D．refer to
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单项选择题
To define science we may simply call it ______.
A．the study of unrelated subjects
B．an attempt to explain natural phenomena
C．the study of unrelated fields
D．classified knowledge
单项选择题
According to the author, all animals ______.
A．spend some time resting
B．close their eyes when sleeping
C．are good sleepers
D．are poor sleepers
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