单项选择题

Nearly (three quarters of the surface) of the earth (are) covered with water, and (there) would be even less land (if) the polar icecaps were melt.

A．three quarters of the surface
B．are
C．there
D．if
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We (strongly) suggest (that) Smith (is told) about (his) physical condition as soon as possible.
A．strongly
B．that
C．is told
D．his
单项选择题
(Red and green) light, (if mixing) (in) the right proportion, (will give) us yellow.（）

A.Red and green
B.if mixing
C.in
D.will give
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