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Howdoesthemangetinformationabouttheapartment?A.FromTVadvertisements.B.Fromadvertisementsinthenewspapers.C.Fromradioadvertisements.

单选题You _____ be too tired--you’ve only been working for an hour.

单选题Why does the woman want to buy a dress?

单选题WheredopeoplewanttospendChristmas?A.Inthepark.B.Athome.C.Inastore.

单选题How many planets orbiting other stars have the two scientists discovered so far?

单选题Which sentence is NOT true?

单选题Howlongistheflight?

单选题Bombing shakes the peace process in Northern Ireland. A home video camera got the scene, moments after the worst single attack in thirty years of conflict(冲突)in Northern Ireland. Hundreds of people were affected by the bombing, some lying in the streets, others clearly in a state of shock. 28 people died in this cruel attack, 220 more injured. Some people got away with wound, many others had [heir arms and legs removed ensuring they'll live with the memory of this bombing for the rest of their lives. The people behind this car bomb obviously wanted to kill as many as people as possible. "Why in the name of killing innocent Saturday shoppers"? What purpose is it going to serve.'? This vicious(恶毒的)attack threatens the fragile peace process. "The peace process is not necessary. We ought to save the lives of the people. That's what are needed to do." But the biggest supporter of peace for Northern Ireland, says now is the time to send a message to the terrorists(恐怖分子)behind the attack. Tony Blair: "That these people will not win; that they will not destroy the process that we have built up; that they will not succeed in returning Northern Ireland to the past. There is a future for Northern Ireland. We have to carry on, trying to give people and the children of Northern Ireland the future they need and they deserve./

单选题The writer said that Chicago was a very big city. That means ______.

单选题Great men never give up ______ difficulty.

单选题Do you agree that power is ______ makes things work?[A] nothing[B] anything[C] what[D] that

单选题阅读下面短文，掌握其大意，然后从36-55各题所给的[A]、[B]、[C]、[D]四个选项中选出最佳答案。 It often appears that we have more to gain by speaking than by listening. One big advantage of speaking is that it gives you a chance to control others' thoughts and actions.{{U}} (36) {{/U}}your goal — to have a boss{{U}} (37) {{/U}}you, to{{U}} (38) {{/U}}others to vote for the person of your{{U}} (39) {{/U}}, or to describe the{{U}} (40) {{/U}}you want your hair cut — the key{{U}} (41) {{/U}}success seems to be the{{U}} (42) {{/U}}to speak well. {{U}} (43) {{/U}}obvious advantage of speaking is the chance it provides to{{U}} (44) {{/U}}the admiration, respect, or liking of others.{{U}} (45) {{/U}}jokes, and everyone will think you're really a wise man.{{U}}(46) {{/U}}advice, and they'll be thankful for help. Tell them all you know, and they'll be{{U}} (47) {{/U}}by your wisdom.{{U}} (48) {{/U}}keep quiet and it seems as if you'll look like a{{U}} (49) {{/U}}nobody. Finally, talking gives you the{{U}} (50) {{/U}}to release energy in a way that listening can't. When you're{{U}} (51) {{/U}}, the chance to talk about your problems can often help you feel{{U}} (52) {{/U}}. In the same way, you can often{{U}} (53) {{/U}}your anger by letting it out orally. It is also helpful to{{U}} (54) {{/U}}your excitement with others by talking about it, for keeping it inside often{{U}} (55) {{/U}}you feeling as if you might burst.

单选题When will the man have a party?

单选题I"m told that during an international game of chess (国际象棋), many beautiful moves could bc made on a chessboard. In a decisive 1 in which he was evenly matched with a Russian master 2 , Marshall found his queen under serious attack. There were several ways of 3 , and since the queen is the most 4 piece, spectators (观众) thought Marshall would naturally move his queen to 5 . Deep in thought, Marshall used all his time to consider the 6 . He picked up his queen, paused, and placed it down on the most 7 square of all—a square from which the queen could be 8 by any one of three enemy pieces. Marshall had sacrificed (牺牲) his queen—an unthinkable move. Everyone else was 9 . Then the Russian, and the 10 , realized that Marshall had actually made a 11 move. It was clear that no matter how the 12 was taken, the Russian would soon be in a 13 position. Seeing this, the Russian admitted his defeat. When spectators recovered from the 14 of Marshall"s daring, they showered the chessboard with money. Marshall had achieved 15 in a very unusual and daring fashion—he had 16 by sacrificing the queen. To me, it"s not 17 that he won. What counts is that Marshall had broken with standard 18 to make such a move. He had looked 19 the usual patterns of play and had been willing to consider an imaginative risk on the basis of his judgment and his judgment alone. No matter how the game 20 , Marshall was the winner.

单选题From the story we know Dr. Johnson ______.