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【单选题】
电力变压器 ( )A.
可以改变直流电压的大小，也可以改变直流电流的大小
B.
可以改变交流电压的大小和频率
C.
只能改变交流电压和交流电流的大小
D.
可以改变交流电压、交流电流和阻抗的大小
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举一反三
【单选题】Whether the buildings in this area should be pulled down has remained ________； people are still looking for other possible solutions. [ ]
A.
unchallenged
B.
relevant
C.
controversial
D.
contradictory
【单选题】The murder still looked ______ in court.
A.
prejudice n. 侵害; 成见，偏见，歧视; 伤害;vt. 使有偏见;
B.
trash n. 垃圾，废物; 断枝，碎块;;vt. 废弃; 拆毁;
C.
fierce adj. 猛烈的; 凶猛的，残忍的; 狂热的;
D.
keen adj. 锐利的; 厉害的，强烈的; 敏锐的，敏捷的; 热心的;
【单选题】Many countries still execute people who__________serious crimes，especially murder．
A.
carry
B.
do
C.
commit
D.
violate
【单选题】After decades of effort, the city is still trying to _____ how to ban smoking in public places.
A.
look through
B.
get through
C.
figure out
D.
take out
【简答题】People feel uneasy about that murder (上周从监狱逃跑) and is still at large.
【单选题】Many countries still execute people who ______ serious crimes, especially murder.
A.
commit
B.
do
C.
carry
D.
violate
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