单选题-- I'm going to Hainan for a sightseeing tomorrow.

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单选题{{B}}C{{/B}} Weather changes when the temperature and the amount of water in the atmosphere change. We can see and feel water coming from the atmosphere when we have rain. But the water must somehow get back to the atmosphere. Meteorologists call this the water cycle. There are many stages in the water cycle. Rain falls when water vapor in clouds condenses (凝结). Drops of water form and fall to the ground. The water soaks into the ground and feeds streams and rivers. A lot of rain falls into the sea. The heat of the sun evaporates some of the water in the ground and in the rivers, lakes, and the sea. It changes the liquid water into water vapor. The vapor rises onto the air. Water vapor is normally invisible. On a very damp of humid day, however, you can sometimes see water vapor rising from a puddle (水坑) or pond in a mist (薄雾) above the water. Water vapor also gets into the air from living things. Trees and other plants take in water through their roots and give off water vapor from their leaves. People and land animal drink water and breathe out water vapor. In all these ways the water returns to the air. There it gathers to form clouds and condenses to form rain. The rain falls to earth, and the cycle starts again. It continues even if snow or hail (冰雹) fall instead because both eventually melt to form water. The amount of water vapor in the air depends on the temperature. The air is more moist (潮湿) in the tropics (热带) than in the cold polar regions.

单选题Whatdidtheboyoftendoatschool?

单选题The goods, which we received, is far from ______.

单选题阅读下面短文，从短文后所给各题的四个选项([A]、[B]、[C]和[D])中选出能填入相应空白处的最佳选项。 {{B}}Plugging into Electronic Databases{{/B}} If you are looking{{U}} (36) {{/U}}information, library shelves are a good place{{U}} (37) {{/U}}. But if you need up-to-the-minute data or have specialized needs, you may{{U}} (38) {{/U}}a computerized database more useful,{{U}} (39) {{/U}}expensive, and less time consuming. A database, a file of{{U}} (40) {{/U}}on one subject or family of subjects, can be{{U}} (41) {{/U}}and maintained in a computer's memory. The speed of the computer then enables you{{U}} (42) {{/U}}any item in this file almost instantly. The three main types of databases are statistics, bibliographies, and full text. Statistical databases store vast{{U}} (43) {{/U}}of numerical data, such as wages and price indexes, census information, foreign exchange rates, and bond prices. Bibliographic databases store references to and{{U}} (44) {{/U}}of articles{{U}} (45) {{/U}}periodicals and newspapers. Full-text databases offer the complete texts of such materials{{U}} (46) {{/U}}newspaper, magazine and journal articles. {{U}} (47) {{/U}}databases exist today, and their numbers are{{U}} (48) {{/U}}Many companies have their{{U}} (49) {{/U}}database,{{U}} (50) {{/U}}is accessible{{U}} (51) {{/U}}employees through computer terminals or microcomputers.{{U}} (52) {{/U}}addition, several hundred commercial data bases are now available{{U}} (53) {{/U}}the public,{{U}} (54) {{/U}}literally millions of information readily retrievable. These databases cover specific fields, such as law and financial{{U}} (55) {{/U}}, or general information, such as sports and weather data.

单选题The hole in the wall is large enough for a bird to fly through without touching

单选题Wherearcthespeakers?

单选题I don't know whether you happen ______ but I'm going to study in the U.S. A. this September.[A] to be heard[B] to be hearing[C] to hear[D] to have heard

单选题Whatarethesetwopeopletalkingabout?A.Sports.B.Music.C.Entertainment.

单选题None of the food was wasted,______? A. were they B. didn't it C. was it D. wasn't it

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单选题--What a beautiful picture!--It's years _______ a picture as beautiful as this one.

单选题People who fly with Bel Air ______.

单选题He had two houses. He lived with his wife and child in the outer house, ______ was comfortable and clean.

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