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【简答题】
Family education has a great _________ on children in many ways.
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文：I'd hang on to that letter. You might need it later. What's the speaker going to do with the letter?
A.
He would throw it away.
B.
He would keep it.
C.
He would post it.
D.
He would stick a stamp on it.
【单选题】What happened to the speaker later?
A.
He tried to kill himself.
B.
He learned to help others.
C.
He fought against his illness.
D.
He got seriously ill.
【简答题】Speaker A: I have to go. See you later. Speaker B: __________A. See you. B. Goodbye. C. Both A and B.
【单选题】Why are passes mentioned by the speaker?
A.
They can be used for a later show.
B.
They are needed to gain entry to an area.
C.
They are valid at the cafeteria.
D.
They can be exchanged at a special counter.
【多选题】属于等产量曲线的特征的有( )
A.
等产量线凹向原点
B.
等产量线向右下方倾斜
C.
等产量线有无数条，其中每一条代表一个产值，并且离原点越远，代表的产量越大
D.
同一平面上任意两条等产量不能相交
E.
等产量线与等成本线相交
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