【題目】For years，scientists have been worried about the ________ of air pollution on the earth's natural conditions. （ ）
A.effect
B.result
C.account
D.cause

【答案】A
【解析】A．effect影響；B．result結(jié)果；C．a(chǎn)ccountt敘述，賬目；D．cause原因，事業(yè)；句意：許多年來，科學家們一直擔心空氣污染對地球的自然環(huán)境帶來的影響。根據(jù)句意，故選A。.

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