多项选择题

关于埃奇沃斯盒状图的说法,以下( )是正确的。
A、埃奇沃斯盒状图中任意一点都可以代表一种分配状态。
B、埃奇沃斯盒状图可以用来分析消费的效率,但生产效率需要用帕累托盒状图来分析。
C、埃奇沃斯盒状图中契约曲线上的所有点都是帕累托最优点。
D、生产的埃奇沃斯盒状图两个顶端分别代表两种商品的所有人。

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单项选择题

Identify the tones of the following passage.A clear relationship between income and voting turnout rates exists. A considerably higher percentage of citizens with annual incomes over 10,000. Income level is, to some degree, connected to education level, as wealthier people tend to have more opportunities for higher education and more education also may lead to higher income. Wealthy citizens are also more likely than poor ones to think that the “system’ works for them and that their votes make a difference. （）
A. Matter-of-fact.

B. Pleading.

C. Sarcastic.

D. Friendly.

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血细胞计数法测定精子密度，多选用（）稀释精液。
A、3%的NaCl
B、2.9%的柠檬酸钠
C、5%的葡萄糖
D、0.9%的NaCl