[题目]Scientists have reached the disturbing conclusion the amount of the solar energy reaching the Earth's surface has been gradually falling.A. that B. why C. whether D. what 题目和参考答案——青夏教育精英家教网—

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【题目】Scientists have reached the disturbing conclusion __________ the amount of the solar energy reaching the Earth's surface has been gradually falling.

A. that B. why

C. whether D. what

【答案】A

【解析】句意：科学家们已经得出了令人不安的结论,到达地球表面的太阳能的数量已经逐渐下降。that 引导同位语从句。

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