The flower bud of a water lily opens at sunset since its opening is triggered by the decreased light.

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问题 The flower bud of a water lily opens at sunset since its opening is triggered by the decreased light.

选项 A、alleviated
B、endured
C、set off
D、covered op

答案C

解析 trigger引发,触发。set off使开始。alleviate使(苦痛等)减轻。endure耐久,忍耐。Cover up掩盖错误、非法地事物等。
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