单项选择题

The word "they" (sentence 4, para. 1) refers to ______.

A．economists
B．chemists
C．world leaders
D．environmentalists
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单项选择题
A．bringingB．takingC．ensembleD．organizing
A．bringing
B．taking
C．ensemble
D．organizing
单项选择题
A．to knowB．knowingC．knowD．having known
A．to know
B．knowing
C．know
D．having known
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