Explain the difference between an adsorption chromatography and a partition chromatography.

Whether you go or not does not () .

A make a difference

B make difference

C make different

D make differences

A.areas

B.countries

C.religions

D.cultural backgrounds

According to the text, the study is originally aimed ______.

A. to show ** differences on revenge

B. to better understand human's behavior. and emotions

C. to cultivate personal likes and dislikes

D. to see if the degree of empathy is connected with personal likes and dislikes

ened the chef for the excellent meal. And later I wrote to _________ him to hís employer, the restaurant owner. Can you ________ the differen musical instruments being played now The manager was unable to attend the meeting but sent his deputy as a（） _________. This arrangement is only _______. When the mid-season is over, you’ll have to go back to yourprevious position. The hunter kept the lion’s skin and head as _______. Last year after the flood, our company ______ large sums of money to relief organizations to help the victims. He was hopeless at French, but his teacher _______ in her efforts to help him. As the problems of his experiments lingered in his mind, he forgot to turn off the tap until the washbasin _________ over with water.

What do we mean by a perfect English pronunciation？ In one (11) there are as many different kinds of English as there are speakers of it. No two speakers speak in exactly the same (12) We can always hear different forms between them, and the pronunciation of English (13) a great deal in different geographical areas. How do we decide What sort of English to use as a model？ This is not a question that can be (14) in the same way for all foreign learners of English. (15) you live in a part of the world like India or West Africa, where there is a long tradition of speaking English for general communication purposes, you should (16) to acquire a good variety of the pronunciation of this area. It would be a fashion in these circumstances to use as a model BBC English or anything of the sort. On the other hand, if you live in a country (17) there is no traditional use of English. You must take as your model some form. of (18) English pronunciation. It does not (19) very much which form. you choose. The most (20) way is to take as your model the sort of English you Can hear most often.

A. meaning

B. sense

C. case

D. situation

Posters for propaganda are used in academic to promote and explain research work.()