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单选题 2级

2010-11-07

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

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参考答案

C

答案解析

[分析]结构应用
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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