The photoperiodic response of algae actually depends on the duration of darkness, but not on the response of light.

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问题 The photoperiodic response of algae actually depends on the duration of darkness, but not on the response of light.

选项 A、is not on light
B、but is not on the light
C、and not on light
D、the light is not on

答案C

解析本句意为：海藻的光周期反应事实上依黑暗的持续时间而定，而不是靠光的反应。英语中表示并列用and，抽象名词和物质名词前不加冠词；因此C为答案。

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