单项选择题

To obtain a satisfactory result, one must apply two ______ of paint on a clean surface.

A. coats
B. levels
C. times
D. courses
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A large part of a person's memory is ______ words and combination of words.
A. by means of
B. in terms of
C. in connection with
D. by way of
单项选择题
After traveling in the desert for many days, they found a tiny oasis, where there was a well and______ green grass.
A. a patch of
B. a bunch of
C. a pinch of
D. a packet of
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