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【单选题】
图示一小球绕点O在铅直面内作圆周运动。当小球由点A运动到点E时，若沿圆弧ADBE运动，其重力所作的功用W 1 表示；沿圆弧ACE运动，其重力所作的功用W 2 表示，则（）A.
A
B.
B
C.
C
D.
D
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举一反三
【简答题】When we design speaking activities we should try to use _______ that are closely related to students’ life.
【单选题】At present we should try to use more ____ facilities.
A.
save-energy
B.
energy-saved
C.
saving-energy
D.
energy-saving
【单选题】In order to make our writing more vivid and precise, we should try to use more _____.
A.
long words
B.
short words
C.
general words
D.
specific words
【单选题】We should try to use ___ money and do ___ work.
A.
little: many
B.
less: more
C.
fewer: more
D.
more: less
【判断题】When we want to use questions to begin the opening paragraph, we should try to use tempting, surprising or controversial questions so as to grab the readers’ attention.
A.
正确
B.
错误
【判断题】While writing English articles, we should try to use long and complex sentences as many as possible.
A.
正确
B.
错误
【简答题】We should try to use some useful ___________ (express) when learning a foreign language.
【单选题】When we are writing an essay, we should try to use ______.
A.
formal and common words
B.
informal words
C.
clichés
D.
slangs
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