单项选择题

The moon, being much nearer to the Earth than the Sun, is the ______ cause of the tides.

A. principal
B. basic
C. initial
D. elementary
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His ______ brain has worked away on the idea of a universal cure.
A. rich
B. quick
C. productive
D. fertile
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The bar in the club is for the ______ use of its members.
A. extensive
B. exclusive
C. inclusive
D. comprehensive
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