单项选择题

Although we are (concerned with) the problem of energy sources, we (must not) fail (recognizing) the need (for) environmental protection.

A．concerned with
B．must not
C．recognizing
D．for
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单项选择题
Whitman wrote Leaves of Grass as a tribute(赞颂) to the Civil War soldiers who (had laid) on the battlefields and (whom) he (had seen) (while serving) as an army nurse.
A．had laid
B．whom
C．had seen
D．while serving
单项选择题
The more the relative humidity(温度) reading (rises), (the worst) the heat (affects) (us).
A．rises
B．the worst
C．affects
D．us
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