单项选择题

A great deal has been done to remedy the situation.

A．maintain
B．improve
C．preserve
D．protect
<上一题 目录 下一题>
热门 试题

单项选择题
The food is insufficient for three people.
A．scarce
B．short
C．marginal
D．inadequate
单项选择题
Most of the butterflies perish in the first frosts of autumn.
A．die
B．disappear
C．migrate
D．vanish
相关试题