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在图像中分别表示：向一定量的硫酸钠溶液中滴加氯化钡溶液，溶液中有关物质质量的变化，正确的是()。

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When Adam Smith spoke of the principle of the "invisible hand" , he meant that______.

A. the government regulates all firms in such a manner that the "social responsibility" of business is assured
B. the pursuit of one's own self-interest will lead to the best good for all
C. cooperation among producers is necessary to minimize losses
D. governmental intervention in the marketplace may be necessary to have steady growth in national output

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脑桥中央髓鞘溶解症是由于（）

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听力原文：M: Liuhua, shall I invite you to drink tea at the Garden Teahouse？
W: Ok, when？
M: How about tomorrow afternoon？
W: No problem. I remember that you like coffee most. Why do you want to drink tea suddenly？
M: I do like coffee, but I have recently taken interest in China's tea culture and want to visit a teahouse.
W: Let me quiz you first. What kind of tea do the Chinese like best？
M: That's too easy, black tea, of course.
What is the man going to do tomorrow afternoon？

A. To drink some coffee.
B. To drink tea with his friend.
C. To buy some tea leaves.

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水蛭素

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