赞题库-背景图
单项选择题

Thesmogmaybesothickthatairportsareclosedandchainsof________occuronthehighways.

A．conflicts
B．contracts
C．contrasts
D．collisions
<上一题 目录 下一题>
热门试题

单项选择题Youmusthurry，___________you‘llbelateforclass.

A．but
B．so
C．or
D．either

单项选择题Thereareseveralways___________wecancrosstheriverwithoutthehelpoflocalvillagers.

A．in which
B．across which
C．to which
D．on which