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【单选题】
结构重力属于()A.
可变作用
B.
永久作用
C.
偶然作用
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反馈参考答案：
举一反三
【单选题】Nowadays, with plentiful ice and electric churning, few people recall the shared excitement of the era when making ice cream was a rarely scheduled event. Then the iceman brought to the back door, on ...
A.
helped to mix the ice cream
B.
ate some ice cream
C.
helped break up the ice with a hammer
D.
protected the ice cream from children
【单选题】Nowadays，few people form the habit of keeping a supply of candles in the house in case of power ________.
A.
drop
B.
lack
C.
absence
D.
failure
【简答题】What information tells us that more women are working nowadays?
【简答题】电话信号分为( )信号和( )信号两种?
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