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．A
B．B
C．C
D．D
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单项选择题
Today we (have made) (great achievements), but tomorrow we (shall win) still (great victories).
A．A
B．B
C．C
D．D
单项选择题
(If) you (try to learn) too many things (at a time) you may get (confusing).
A．A
B．B
C．C
D．D
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