中国共产党正式确定第一次国共合作方针和办法的会议是

To most of the students, Economics ()always an important subject, also a difficult one.

A、is

B、are

C、have been

D、was

Which of the following sentences includes a subject clause？

A．A prosperity that had never been seen before appears in the country.

B．He must answer the question whether he agrees to it or not.

C．He told me that he had told Mary about the meeting already

D．It is suggested that the work should be done with great care.

Part A

Write a letter to the Economics Department in London University in which to apply for the MS course of Economics and Statistics. In this letter, tell them:

(1) Where you get the information of this subject;

(2) Your experience;

(3) Why you choose this subject.

You should write approximately 100 words. Do not sign your own name at the end of your letter. Use "Xiao Xin" instead. You do not need to write the address.

此题为判断题(对，错)。

B、there is additional profit when the marginal cost of a unit is higher than the price

C、there is no more profit when the price is greater than the marginal cost of the last unit

D、price is not important in determining profit

E、none of the above