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【单选题】
差异曲线为斜率不变的直线时,表示相结合的两种商品是A.
可以替代的;
B.
完全替代的;
C.
互补的;
D.
互不相关的。
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举一反三
【多选题】选择合适的应答语。 1. () What’s the matter?
A.
It ’ s sour. 2. () Taste the lemon,how is it?
B.
I can hear a plane. 3.()What can you hear?
C.
No.I don ’ t. 4.()Do you like bears?
D.
I have some milk. 5.()What do you have?
E.
I can ’ t find my pen. (20.0分)
【简答题】完形填空。 Listen. Do you hear that?Whatever it is - the hum (嗡嗡声) of a computer,the birds outside, a car going by ―you can hear it and 1 which direction it's coming from thanks to your ears. Hearing is t...
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