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

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

admin2011-01-26  74
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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