单选题The science of beauty has changed with time, but the desire for beauty remains the same.A)美容学随着时代而变化，但人们对美的追求一直没变。B)美容学随着时代而发生了变化，但人们一样保持美丽。C)美容学随着时代而发生了变化，但人们对美的欲望一直没变。D)科学的美丽在时间中发生了变化，但人们一直保持美丽。

单选题Knock______the door before you enter the room．

单选题People all over the world today are beginning to hear and learn more and more about the problem of pollution. Pollution is caused either by man"s release of completely new and often artificial (人造) substances into the environment, or by releasing greatly increased amounts of a natural substance (物质), such as oil from oil tankers into the sea. Whatever its underlying reasons, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts.In the home there is an obvious need to control litter and waste. Food comes wrapped up three or four times in packages that all have to be disposed of; drinks are increasingly sold in bottles or tins which cannot be reused. This not only causes a litter problem, but also is a great waste of resources, in terms of glass, metal and paper. Advertising has helped this process by persuading many of us not only to buy thing we neither want nor need, but also to throw away much of what we do buy. Pollution and waste combine to be a problem everyone can help to solve by cutting out unnecessary buying, excess use and careless disposal of the products we use in our daily lives.

单选题No one knew about this beautiful place until last year. A. 直到去年，人们才知道有这么美丽的地方。 B. 到去年还没有人知道这个美丽的地方。 C. 没有人知道这个美丽的地方，直到去年。 D. 去年才有人到过这个美丽的地方。

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单选题Why was it difficult to get the public to accept shopping carts at first?

单选题Modern scientists have been able to find out which substances in food our bodies need, and how much of these substances we need to be healthy. In other words, it isn"t enough just to eat; we must take in enough of each type of food substance for a specific purpose.

单选题Xiamen is well-known as“Hawaii in the East”with colorful view and rich folk culture．It has attracted many tourists from around the world．Since the 1990s，tourism(旅游业)in Xiamen has gained an unexpected development，with a great number of visitors each year coming to enjoy the variety and beauty that this sea-side resort(胜地)offer．

单选题Hospital doctors don't go out very often as their work ______ all their time.A) takes in C) takes overB) takes away D) takes up

单选题There are lots of trees ______ the river. A. in either side of B. in either sides of C. on either sides of D. on either side of

单选题The doctor suggested that she ______

单选题I had told them the reason, ______ I didn't attend the meeting.

单选题Professor White has written some short stories, but he is ______ known for his plays. A. the best B. more C. better D. the most

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单选题______ is known to all, Peking University is one of the most famous universities in China.

单选题______ Paris, he is preparing for the trip.

单选题They didn't sec any land until they reached the islands off the coast Of Asia.

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单选题Thousands. of young people have learned ______ cars.

单选题The book is worthy of ______, I think.