单选题My grandpa gave me a watch, which is made of gold, ______I keep to this day.

单选题A possible reason that a child having an unhappy relation with his/her mother will not be affected by maternal separation at 6 to 9 months is that ______.

单选题Mosquitoes ______ breed in swampy areas.A. alwaysB. rarelyC. neverD. generally

单选题______ Party B fail to pass on his orders to Party A in a period of..．months for a minimum of..．, Party A shall not bind himself to this Agreement. A．Would B．Shall C．Could D．Should

单选题Chinese arts have won the ______ of a lot of people outside China.A. enjoymentB. appreciationC. entertainmentD. reputation

单选题Having spent two days on one subject and ______ two days on the other subject, I am now ready for the exam. A. other B. next C. those D. another

单选题He has just finished fixing the door, and it looks as though______a very hard job

单选题Despite the fact that the two council members belonged to different political parties. They ______ the issue of how to finance the town debt.

单选题To get the job started, ______ I need is your permission. A. only what B. all what C. all that D. only that

单选题Continued use of alcohol and drugs can ______.

单选题A wheel is any dish like object that can be used for transportation or in machinery. To be useful, a wheel must revolve (1) an axle, which is normally a shaft attached (2) the wheel's center. No one is exactly sure when the wheel was first (3) . But it is thought to have been in use during the early Bronze Age in the Tigris-Euphrates Valley in the Middle East— (4) Iraq is located today. We know that ancient people there used (5) . These and other wheeled vehicles are shown in artwork from the area (6) back to 3500 B.C. How were such (7) developed? The idea began when people placed logs as rollers under a platform. They were used to (8) heavy loads. The center of the logs may have been partly hewn, or carved away, (9) a narrow axle between solid, thick wheels at each end. Some ancient Middle East people even wrapped leather tires around the solid wooden wheels attached to (10) carts. Probably the first way (11) wheels were used other than for transportation was in pottery making. (12) beautiful and useful pieces of pottery, a potter puts a lump of clay on a horizontally placed wheel which is attached to an axle. (13) the potter sits facing the wheel and makes it spin, using a foot pedal. The potter molds the clay, using both hands (14) fingers, as the wheel spins. Thus the clay is (15) . Various objects (16) bowls, plates, vases, and cups are produced in this manner. The wheel and axle also have other (17) . They are part of many (18) . An axle attached to a wheel, so that both spin at the same time, permits the use of small amounts of force to (19) very heavy load. This wheel-and-axle principle is used in all weight-lifting devices, such as cranes, hoists, and elevators. For example, by pulling a rope wrapped around the rim of a wheel, a person can lift a massive object with only a (20) amount of effort.

单选题The colors red, blue, and yellow can be mixed in different combinations to make every color the human eye can distinguish.

单选题Smoking, which may be a pleasure for some people, is a serious source of discomfort for their fellows. Medical authorities express their (31) about the effect of smoking on the health not only (32) those who smoke but also of those who do not. In fact, nonsmokers who must involuntarily inhale the air polluted by the tobacco smoke may (33) more than the smokers themselves. As you are doubtless aware, a considerable number of our students have (34) an effort to (35) the university to ban smoking in the classrooms. I believe they are entirely right in their aim. (36) , I would hope that it is possible to achieve this by (37) on the smokers to use good judgment and show concern for others rather than (38) regulation. Smoking is prohibited by city laws in theaters and in halls used for showing films as well as in laboratories (39) there may be a fire hazard. Elsewhere, it is up to your good sense. I am therefore asking you to maintain "No Smoking" in the auditoriums and classrooms. This will prove that you have to keep nonsmokers' health and well-being (40) , which is very important to a large number of our students.

单选题People can communicate ______.

单选题He was very upset by the ______ of his English examination. A. effect B. loss C. result D. final

单选题If law and order ______ not preserved, people will not be able to live a secure life. ( )

单选题The following two questions refer to the following passage: A prestigious private high school has made available to local families a tuition prepayment plan to ease the burden of paying the school's hefty tuition when a student matriculates. The plan allows parents of children under three years old to reserve a spot for their child at the school by making a payment of one-fourth of the current annual tuition for the high school. The parents then make an identical payment every year for the next 15 years, and the student's full four-year tuition is considered paid in full, regardless of how much the regular tuition payments have risen in the intervening years.