A large ______of the sunlight never reaches the earth while infra-red heat given off by the earth is allowed to escape freely.

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问题 A large ______of the sunlight never reaches the earth while infra-red heat given off by the earth is allowed to escape freely.

选项 A、proportion
B、ratio
C、rate
D、fraction

答案A

解析 a large proportion of一大部分；in a ratio of以……的比例；at a rate of以……的速率； a fraction of一小部分。

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