C
18.concentrate v.全神贯注,精神集中,专心致志;集中,集合;浓缩
We should concentrate all our efforts on improving education.我们应该集中精力努力改进教育工作。
Troops are concentrating south of the river.军队正向河的南边集结。
n.浓缩液
【用法】concentrate(sth.)on sth./doing sth.
【全真考题】Anne couldn't concentrate what she was doing while her family were watching TV.
A.to
B.on
C.for
D.in
【答案】B
19.continual adj.继续不断的;一再重复的 continual rain 不停的雨
【辨析】continual与continuous
continual一般指多次重复的动作:Please stop your continual questions.
continuous表示动作或物体继续不停地或不间断地进行下去:a continuous flow of traffic
【全真考题】Our journey was slow because the train stopped at different villages.
A.unceasingly
B.gradually
C.continuously
D.continually
【答案】D
20.contrary adj.(在性质、倾向或方向等方面)相反的;好与人作对的
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