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

(It) was (her) (who) represented her country in the United Nations and (later) became ambassador (大使) to the United States.（）

A. was
B. her
C. who
D. later

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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