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【多选题】
保护接地和保护接零的区别是（ ）。A.
保护原理不同
B.
保护对象不同
C.
适用范围不同
D.
线路结构不同
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反馈参考答案：
举一反三
【简答题】中年人脂肪的摄取应占总热量的多少最为适宜。() A10%～15% B20%～25% C30%～35% D40%～45%
【单选题】Why does the man look so tired?
A.
He worked for the whole night.
B.
He played computer games last night.
C.
He talked with his roommate last night.
D.
He was bothered by the noise in his room.
【单选题】—Mr. White didn’t come last night ,did he? —No ,we for him. A whole night was wasted.
A.
had waited
B.
have been waiting
C.
were waiting
D.
had been waiting
【简答题】Struggling his way in the dark for a whole night, he finally found himself ______( lose) in the forest.
【单选题】.— Mr White didn't come last night, did he? — No. We _____for him . A whole night was wasted.
A.
had waited
B.
have been waiting
C.
were waiting
D.
had been waiting
【简答题】The news that he had passed the exam made his mother stay a_______ for a whole night.
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