According to biologists, animal populations at a given time are _________ by foo

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问题 According to biologists, animal populations at a given time are _________ by food supplies at that time.

选项 A、governed
B、sustained
C、mediated
D、manipulated

答案 A

解析 动词辨义。govern 意为“统治,支配”,如:Chance usually governs the outcome of the game.(运气经常操纵比赛的结果。)sustain意为“支撑,持续”,如:The sea wall sustains the shock of the waves.(海堤能抵挡海浪的冲击。) mediate 意为“调解,斡旋”,如:He mediated a settlement between labor and management.(他在劳资双方间通过调停达成和解。) manipulate 意为“操作,操纵”,通常指操纵人、市价或市场,如:He manipulated public opinion in his favor.(他巧妙地使公众舆论倒向他。)根据题意,应选A)。
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