单选题Water on the earth is being continuously recycled in a process known as the hydrologic cycle. The first step of the cycle is the evaporation of water in the oceans. Evaporation is the process of water turning into vapor, which then forms clouds in the sky. The second step is the water returning to the earth in the form of precipitation, either rain, snow, or ice. When the water reaches the earth's surface, it runs off into the rivers, lakes, and the ocean, where the cycle begins again. Not all water, however, stays on the surface of the earth in the hydrologic cycle. Some of it seeps (渗透) into the ground through infiltration and collects under the earth's surface as groundwater. This groundwater is extremely important to life on earth since 95% of the earth's water is in the oceans, and is too salty for humans of plants. Of the 5% on land, only 0.05% is above ground in rivers or lakes. The rest is underground water. This groundwater is plentiful and dependable, as it doesn't depend on seasonal rain or snow. It is the major source of water for many cities. But as the population increases and the need for water also increases, the groundwater in some areas is getting dangerously low. Added to this problem is an increasing amount of pollution that seeps into the groundwater. In the future, with an increasing population and more toxic(有毒的)waste, the hydrologic cycle we depend on could become dangerously imbalanced.

单选题Andy worked ____ of all, so he always had the best performance in his class.

单选题My parents______me to go to the theatre with my classmates But! didn't. A. suggested B. advised C. made D. persuaded

单选题What'sthebestwaytotravelinmostcities?

单选题Howdidthemanfeelaboutthehotelonthefirstday?

单选题{{B}}B{{/B}} Most people have had a dog or wanted one as their companion at some time in their lives. If you are thinking of buying a dog, however, you should first decide what sort of companion you need and whether the dog is likely to be happy in your house. Specialists' (专家) advice is useful to help you choose the most suitable kind of dog. But in part the decision depends on common sense. Different dogs were developed to perform specific tasks. So, if you want a dog to protect you, or your house, for example, you should choose the one that has the right size and characteristics. You must also be ready to devote (投入) a great deal of time to training the dog when it is young and give it the exercise it needs throughout its life, unless you live in the countryside and can let it run freely. Dogs are demanding pets. Cats love the house and so are satisfactory with their place where there is secure, but a dog is loyal to its master and consequently wants him to show proof of his {{U}}affection{{/U}}. The first consideration in buying a dog is whether the dog is likely to be happy in the surroundings you can provide. The best time to buy a baby dog is when it is between 6 and 8 weeks old so that it can transfer its love from its mother to its master. If baby dogs have not established a relationship with the human being until they are over three months old, their strong relationship will always be with dogs. They are likely to be too shy when they are brought out into the world to be- come good pets.

单选题When did the first Donald Duck film appear?

单选题WhydidCarolyndecidetobakecookies?

单选题Since last year, she ______ of the long distance.

单选题Atwhattimedoesthemanusuallyhavedinner?

单选题[此试题无题干]

单选题

单选题Wheredoesthisconversationtakeplace?A.Attheairport.B.Inarestaurant.C.Onthestreet.

单选题Please give this notebook ______ comes for it. A. to whomever B. to whoever C. whomever D. whoever

单选题A driver will be punished immediately if he is found ______ while he is driving． A. make a phone call B. made a phone call C. making a phone call D. to make a phone call

单选题阅读下面短文，掌握其大意，然后从36～55各题所给的四个选项([A]、[B]、[C]和[D])中，选出最佳选项。 One afternoon I was sitting at my favorite table in a restaurant, waiting for the food I had ordered. Suddenly I{{U}} (36) {{/U}}that a man sitting at a table near the window kept glancing in my direction,{{U}} (37) {{/U}}he knew me. The man had a newspaper{{U}} (38) {{/U}}in front of him, which he was{{U}} (39) {{/U}}to read, but I could{{U}} (40) {{/U}}that he was keeping an eye on me. When the waiter brought my{{U}} (41) {{/U}}, the man was clearly puzzled (困惑) by the{{U}} (42) {{/U}}way in which the waiter and I{{U}} (43) {{/U}}each other. He seemed even more puzzled as{{U}} (44) {{/U}}went on and it became{{U}} (45) {{/U}}that all the waiters in the restaurant knew me. Finally he got up and went into the{{U}} (46) {{/U}}. When he came out, he paid his bill and{{U}} (47) {{/U}}without another glance in my direction. I called the owner of the restaurant and asked what the man had{{U}} (48) {{/U}}"Well," he said, "that man was a detective (侦探). He{{U}} (49) {{/U}}you here because he thought you were the man he{{U}} (50) {{/U}}." "What?" I said, showing my{{U}} (51) {{/U}}. The owner continued, "He came into the kitchen and showed me a photo of the wanted man. I{{U}} (52) {{/U}}say he looked very much like you! Of course, since we know you, we told him that he had made a{{U}} (53) {{/U}}. " " Well, it's really{{U}} (54) {{/U}}I came to a restaurant where I'm known,"I said."{{U}} (55) {{/U}},I might have been in trouble."