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【简答题】
人们衣食住行都离不开材料，下列材料中属于天然有机高分子材料的是（ ） A．蚕丝 B．尼龙 C．涤纶 D．塑料
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【简答题】在对流温度差大小相同的条件下，在夏季和冬季，屋顶天花板内表面的对流放热系数是否相同？为什么？
【简答题】在对流温度差大小相同的条件下，在夏季和冬季，屋顶天花板内表面的对流换热系数是否相同?为什么?
【单选题】She is already 16years old、But she____as if she were still a little girl.
A.
believes
B.
absorbs
C.
accrses
D.
behaves
【简答题】A．No, because she's already spent most of it. B．No, because she has already lent it to a friend. C．Yes, because she got some while she was shopping. D．Yes, because she wants to help him.
【单选题】---Does Miss Ye like playing __________tennis? ---No, she doesn’t, but she likes playing ________ piano.
A.
the; the
B.
/; the
C.
the; /
D.
a; a
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