单项选择题

The fridge’s effect upon the environment has been evident, while its contribution to human happiness has been insignificant.

A．冰箱在促进人类幸福的同时，也对环保有较明显的影响。
B．冰箱对环保的影响显而易见，对人类幸福的贡献却少之又少。
C．冰箱对环境的影响显而易见，对人类幸福的贡献却微不足道。
D．冰箱对环境的影响显而易见，对人类幸福也有重大贡献。

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Which of the following might NOT cause insomnia according to the passage().

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Teachers encourage the early use of dictionaries because it helps ().

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