单选题As a result of pollution, Lake Erie, on the borders of the U. S. A. and Canada, now does not have many living things. Pollution in water is not simply a matter of "poisons" killing large numbers of fish overnight. Very often the effects of pollution are not noticed until many months or years later because the first organisms (生物) to be affected are either plants or planktons (浮游生物). These organisms are the food of fish, birds, and other creatures. When this food disappears, the fish and birds would die too. In this way a whole food chain can be wiped out, and it is not until dead fish and water birds are found at the river's edge or on the sea shore that people realize what is happening. Where do the substances that pollute the water come from? There are two main sources, sewage (生活污水) and industrial waste. As more detergent (洗涤剂) is used in the homes, more of it is finally put into our rivers, lakes and seas. Detergent harms water birds by breaking down the natural substances which keep their feathers waterproof. Sewage itself, if not properly treated, makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen they need. Industrial waste is even more harmful since there are more highly poisonous materials in it, such as copper and lead. So, if we want to stop this pollution, the answer is simple. Sewage and industrial waste must be made clean before flowing into rivers and seas. It may be already too late to save some rivers and lakes, but others can be saved if the correct action is taken at once.

单选题Would you like a cup of coffee first, ______shall we get down to business right now?

单选题What is the man going to do?

单选题The oldest spelling form of pidgin is ______.

单选题HowlongwasDilyslate?

单选题— Would you mind holding the door open for me, please? —______.

单选题After taking the course of International Studies, the students will ______.

单选题听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。

单选题I have no objection ______ his staying in the classroom as long as he keeps quiet.

单选题—Would you like another glass of beer? — ______ A. You're welcome B. Never mind C. Don't mention it D. No, thanks

单选题Whichistheauthor'squestion?[A]DoyouhavetimetoplayorwatchTV?[B]Willyoumissyourparentsifyouamdepartedfromthemforawholeday?[C]Doyoulikenaughtyboys?

单选题— Listen, Tom, I am not coming tonight. — But you ______!

单选题

单选题Football is, I suppose, the most popular game in England: one has only to go to one of the important matches to see this. Rich and poor, young and old, one can see them all there, shouting and cheering for one side or the other. One of the most surprising things about football in England to a stranger is the great knowledge of the game which even the smallest boy seems to have. He can tell you the names of the players in most of the important teams. He has photographs of them and knows the results of a large number of matches. He will tell you, with a great air of authority, who he expects will win such and such a match, and his opinion is usually as valuable as that of men three or four times his age. Most schools in England take football seriously—much more seriously than nearly all European schools, where lessons are all-important(至关重要的) , and games left for private arrangements. In England, it is believed that education is not only a matter of filling a boy's mind with facts in a classroom; education also means character training; and one of the best ways of training character is by means of games, especially team games, where the boy has to learn to work with others for his team, instead of working selfishly (自私地) for himself alone. The school therefore arranges games and matches for its pupils. Football is a good team game, it is good exercise for the body, it needs skill and a quick brain, it is popular and it is cheap: as a result, it is the school's favorite game in the winter.

单选题He is very helpful. What he did for us made the job much easy

单选题______ Mr. Li called today, but not ______ Mr. Li who called yesterday.

单选题Peter ______ come tonight, but he isn't very sure yet.

单选题"Your dress is so beautiful, I wish I could have one myself."