单选题Look, here ______.A. Mr. Brown comes B. comes he Mr. BrownC. comes Mr. Brown D. Mr. Brown has come

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

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A. cover B. cropC. create D. cycle

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

单选题W: We are going to go away on vacation...Can you hear me? M: I"m all ears. Q: What does the man mean?

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Whether the cause is maternal anti-bodies, heavy metals or something else, there is no question that the brains of young children with autism have unusual features. To begin with, they tend to be too big. In studies based on magnetic resonance imaging(MRI)and basic tape-measure readings , neuroscientist Eric Courchesne at Children" s Hospital of San Diego showed that while children with autism are born with ordinary-size brains, they experience a rapid expansion by age 2—particularly in the frontal lobes. By age 4, says Courchesne, autistic children tend to have brains the size of a normal 13-year-old. More recent studies by Admiral and others have found that the amygdale, an area associated with social behavior, is also oversize, a finding Admiral believes is related to the high levels of anxiety seen in as many as 80% of people with autism. Harvard pediatric neurologist Dr. Martha Herbert reported last year that the excess white matter in autistic brains has a specific distribution; local areas tend to be over connected, while links between more distant regions of the brain are weak. The brain" s right and left hemispheres are also poorly connected. It" s as if there are too many competing local services but no long distance. This observation jibes neady with imagining studies that look at live brain activity in autistic people. Studies using functional MRI show a lack of coordination among brain regions, says Marcel Just, director of Carnegie Mellon" s Center for Cognitive Brain Imaging in Pittsburgh, Pa. Just has scanned dozens of 15-to-35-year-old autistic people with IQs in the normal range, giving them thinking tasks as he monitors their brain activity. " One thing you see," says Just, " is that activity in different areas is not going up and down at the same time. There" s a lack of synchronization, sort of like a difference between a jam session and a string quartet. In autism, each area does its own thing. " What remains unclear is whether the interconnectivity problem is the result of autism or its cause. "It" s impossible to tell the chicken from the egg at this point," Just says. Autistic people have been shown to use their brains in unusual ways; they memorize alphabet characters in apart of the brain that ordinarily processes shapes. They tend to use the visual centers in the back of the brain for tasks usually handled by the prefrontal cortex. They often look at the mouth instead of the eyes of someone who is speaking. Their focus, says psychologist Ami Klin of Yale" s Child Study Center, is " not on the social allegiances—for example, the longing gaze of a mother—but physical allegiances—a mouth that moves. "

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People can communicate ______.

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

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