单选题People shouldn't smoke unless

单选题Plugging into Electronic Databases If you are looking (36) information, library shelves are a good place (37) . But if you need up-to-the-minute data or have specialized needs, you may (38) a computerized database more useful, (39) expensive, and less time consuming. A database, a file of (40) on one subject or family of subjects, can be (41) and maintained in a computer's memory. The speed of the computer then enables you (42) any item in this file almost instantly. The three main types of databases are statistics, bibliographies, and full text. Statistical databases store vast (43) of numerical data, such as wage and price indexes, census information, foreign exchange rates, and bond prices, bibliographic databases store references and (44) of articles (45) periodicals and newspapers. Full-text databases offer the complete texts of such materials (46) newspaper, magazine and journal articles. (47) databases exist today, and their numbers are (48) . Many companies have their (49) database, (50) is accessible (51) employees through computer terminals or microcomputers. (52) addition, several hundred commercial data bases are now available (53) the public, (54) literally millions of information readily retrievable. These databases cover specific fields, such as law and financial (55) , or general information, such as sports and weather data.

单选题He is very helpful. What he did for us made the job much easy A. done B. doing C. to do D. being done

单选题I don't want this bread; it's ______ .

单选题Jane owes ______ to her father that she has been able to finish her college education. A. that B. much C. it D. /

单选题______ break the law should be punished.

单选题Howmanypeoplearethereinthewoman'sfamily?

单选题—How can I mend it? —Well, look at the______, please.

单选题I ______ you not to move my dictionary. Now I can't find it.[A] asked[B] ask[C] was asking[D] had asked

单选题This is ______ car. He has done well in business. A.my friend's, Mr. King's B.my friend's, Mr. King C.my friend, Mr. King's D.Mr. King's, my friend

单选题After a serious earthquake, a lot of buildings ______.

单选题How will the donated money be used?

单选题When you close your eyes and try to think of the shape of your own body, what you 1 is quite different 2 what you see when you open your eyes and look 3 the mirror. The image you feel 4 is a bit different from the one you see. And if 5 lie still, it is quite hard to imagine yourself as having any particular size or 6 . When you move, when feel the weight of your arms and 7 , the "felt" image of 8 starts to become clearer. The image you create for yourself is rather 9 : some parts feel much 10 than they look. If you use your tongue to feel a hole in one of your 11 , it 12 so large; you are often 13 by how small it looks when you see 14 in the mirror. But although the "felt" 15 may not have the shape you see in the mirror, it is much 16 important. It is the image through 17 you see your physical existence 18 the world. If the "felt" image is damaged 19 any reason — if it is cut in half or lost — to feel a pain or find your nose in the dark becomes 20 impossible.

单选题Tom ______ along the street when he ran into an old friend who used to help him with his studies. A. was walking B. had walked C. would walk D. walked

单选题At which of the following times will the bus leave the main hall?

单选题When Circe "stood" there, what message did she try to send to Reiss?