题文
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 |
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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 |
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