【題目】It's reported that 70% of people in China are _________ about the food security situation after so many accidents.
A.concerning
B.concerned
C.cautious
D.certain

【答案】B
【解析】考查固定短語。句意：據(jù)報道，發(fā)生這么多事故之后，中國有7０％的人擔憂食物安全。be corncerned about固定短語，“對.....擔憂”。可知答案為B。

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