单项选择题

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

A．ratio
B．proportion
C．rate
D．fraction
<上一题 目录 下一题>
热门 试题

单项选择题
20. Like flowers that have been waiting all winter to blossom, tourists are eager to burst forth with their cameras.
A．survive
B．breeze
C．bloom
D．revive
单项选择题
It is true that London is often sunless, damp and raw, though the occasional sunny days seem all themore attractive by contrast.
A．mild
B．chilly
C．cloudy
D．moist
相关试题