单选题______ is the study of the characteristics of language varieties, the characteristics of their functions and the characteristics of their speakers as these three constantly interact and change within a speech community.

单选题Two TV cameras ______ eyes of a mechanical man. A. are served as B. serve as C. will be serve as D. were serve as

单选题What do we mean by a satisfactory standard of living? Obviously, it must include the basic necessities of life such as food, clothing and shelter. To get these necessities on regular basis, a person must have a reliable income. But we have other needs which would probably also be included as basic, such as health and education facilities. We may think of all of these as our needs. Yet most of us would be far from satisfied if we had nothing more than these which are supplied for us. We all enjoy extra income to spend on things like books, sports or hobbies. Sometimes we save some of this extra income to pay for future expense of this type on holidays. So we must add our wants to our basic needs. Our standard of living is the degree, to which these needs and wants are satisfied. But as time goes on, what we think of as our basic needs changes. Twenty years ago a teleisvion would have been a luxury, and still is in many countries now. Even now we cannot say it is a need in the same sense as food, clothing and shelter. Yet if most of the people of a country have one, it comes to be accepted as a need. It is possible therefore to have food, clothing and shelter and still be poor by the standards of our own society.

单选题Not finding the key, the firemen had to _____ the door to get into the burning house.

单选题The factory is quite different from _______ before

单选题It's no use ______ any longer. He may come by any bus. A. waiting B. to wait C. having waited D. to have waited

单选题W : How long can I keep the book? M:__________

单选题We are looking forward to ______ to the lecture by the famous professor.

单选题Not until I came to China ______ what kind of country it is.

单选题Some people like fatty meat, ______ others hate it. A. somehow B. moreover C. whereas D. furthermore

单选题Living in the central American desert has its problems, ______ obtaining water is not the least.

单选题Man: My car is dirty. Woman: Why don't you wash it? Man: (1) Woman: Are you going to wash it yourself? Man: Of course. (2) Woman: I'll help you. Man: Okay, I'll get a bucket. Woman: (3) Man: Then we can scrub it with a wet sponge and soap. Woman: (4) we can dry it with a towel. Man: Then it will look like a new car. Woman: And you save ＄10. A. After that, B. It's not a hard job. C. That's what I'm going to do. D. I'll rinse the car first.

单选题Mary, together with her classmates, are in the lobby, waiting to discuss with you the plans for the coming sports meet.

单选题Henry is often seen ______ English aloud every morning in the classroom.

单选题His agreement to buy our house was ______ on us leaving all the furniture in it.A. conductiveB. conditionalC. consistentD. conscious

单选题The problem will be discussed at length in the ____ Chapter.

单选题Fifteen minutes ______ I can spare to talk over this matter with you.

单选题He got injured because of his faulty brakes. He ______ to see if his brakes were working properly.