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

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

admin2009-07-06  73
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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