单项选择题

The differential attractions of the sun and the moon (have) a direct effect (in) the (rising) and falling (of) the tides.

A. have
B. in
C. rising
D. of
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(If) it receives (enough) rain at the proper time, hay (will grow) quickly (as) grass.
A. If
B. enough
C. will grow
D. as
单项选择题
Psychology Today (is) (interesting), informative, and (it is) easy (to read).
A. is
B. interesting
C. it is
D. to read
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