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【单选题】
下列关于城镇体系和城镇体系规划的表述，准确的是( )A.
城镇体系是对一定区域内的城镇群体的总称
B.
城镇体系规划的目的是构建完整的城镇体系
C.
城镇体系规划是一种区域性规划
D.
城镇体系中只有一个中心城市
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【单选题】Let's go to the chemist's shop _____ we can get the medicine we need. [ ]
A.
what
B.
where
C.
that
D.
which
【单选题】听力原文：W: Hello, Patrick, is that you? M: Yeah Jane, what can I do for you? W: I was calling about the apple tree that you were trimming yesterday. M: That was hard work! W: I'm sure it was. It sure loo...
A.
He picked up some apples in his yard.
B.
He cut some branches off the apple tree.
C.
He quarreled with his neighbor over the fence.
D.
He cleaned up all the garbage in the woman's yard.
【单选题】Which of the following is the best title for this passage?
A.
Where Can We Get Vitamin D?
B.
Do You Have Enough Vitamin D?
C.
What Are the Functions of Vitamin D?
D.
Can Vitamin D Improve Your Athletic Performance?
【单选题】长期平均成本LAC曲线表示（）
A.
厂商在长期内在每一产量水平上实现的最大的平均成本
B.
厂商在长期内增加一单位产量所引起的最低总成本的增量
C.
厂商在长期内增加一单位产量所引起的最低平均成本的增量
D.
厂商在长期内在每一产量水平上可以实现的最小的平均成本
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