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
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.