单选题{{B}}E{{/B}} The concept of personal choice in relation to health behaviors is an important one. An estimated 90 percent of all illnesses may be preventable if individuals would make sound personal health choices based upon current medical knowledge. We all enjoy our freedom of choice and do not like to see it restricted when it is within the legal and moral boundaries of society. The structrue of American society allows us to make almost all our own personal decisions that may concern our health. If we so desire, We can smoke, drink excessively, refuse to wear seat belts, eat whatever foods we want, and live a completely sedentary life-style without any exercise. The freedom to make such personal decisions is a fundamental aspect of our society, although the wisdom of these decisions can be questioned. Personal choices relative to health often cause a difficulty. As one example, a teenager may know the facts relative to smoking cigarettes and health but may be pressured by friends into believing it is the socially accepted thing to do. A multitude of factors, both inherited and environmental, influence the development of health-related behaviors, and it is beyond the scope of this text to discuss all these factors as they may affect any given individual. However, the decision to adopt a particular health-related behavior is usually one of personal choices. There are healthy choices and there are unhealthy choices. In discussing the morals of personal choice, Fries and Crapo drew a comparison. They suggest that to knowingly give oneself over to a behavior that has a statistical probability of shortening life is similar to attempting suicide. Thus, for those individuals who are interested in preserving both the quality and quantity of life, personal health choices should reflect those behaviors that are associated with a statistical probability of increased vitality and longevity.

单选题What made British people happy when Ann Jones won the ladies' singles in 1969?

单选题When are they leaving?

单选题Speeding off in a stolen car, the thief thinks he has got a great catch. But he is in for an unwelcome surprise. The car is fitted with a remote immobilizer(锁止器), and a radio signal from a control centre miles away will ensure that once the thief switches the engine off, he will not be able to start it again. The idea goes like this. A control box fitted to the car contains a mini-cell-phone, a microprocessor and memory, and a GPS(全球定位系统) satellite positioning receiver. If the car is stolen, a coded cell-phone signal will tell the control centre to block the vehicle's engine management system and prevent the engine being restarted. In the UK, a set of technical fixes is already making life harder for car thieves. "The pattern of vehicle crime has changed," says Martyn Randall, a security expert. He says it would only take him a few minutes to teach a person how to steal a car, using a bare minimum of tools, but only if the car is more than 10 years old. Modern cars are far tougher to steal, as their engine management computer won't allow them to start unless they receive a unique ID code beamed out by the ignition(点火) key. In the UK, technologies like this have helped achieve a 31% drop in vehicle-related crime since 1997. But determined criminals are still managing to find other ways to steal cars, often by getting hold of the owner's keys. And key theft is responsible for 40% of the thefts of vehicles fitted with a tracking system. If the car travels 100 meters without the driver confirming their ID, the system will send a signal to an operations centre that it has been stolen. The hundred meters minimum avoids false alarms due to inaccuracies in the GPS signal. Staff at the centre will then contact the owner to confirm that the car really is missing, and keep police informed of the vehicle's movements via the car's GPS unit.

单选题In the third paragraph, the phrase "put on stage" ( line 3, para. 3 ) means ______.

单选题If the work ______ by the end of the month is delayed, the construction company will be fined.[A] to be completed[B] is completed[C] to have been completed[D] being completed

单选题

单选题I had hoped to go into the fire to fetch the expensive box, but my roommate told me ______.

单选题Who watched the football game last night?

单选题I first met Lisa three years ago when we ______ at a radio station together. A. have worked B. had been working C. were working D. had worked

单选题The American movies are popular because ______.

单选题In September, in Britain, you may see a lot of birds (36) on roofs and telegraph wires. These birds are swallows. They are (37) together because, very soon, they will be flying (38) to much warmer lands, where they will find (39) small flying insects on which they (40) . There are no such insects (41) in Britain during the winter, as it is (42) cold for them. The swallows settle, fly off, swoop, and (43) again. This they do many times, for they are making short (44) flights in order to be fit for the long journey (45) them. (46) of these migrating birds leave Britain in the autumn. They fly (47) for hundreds of miles (48) they reach the warm lands of Africa. But not all the birds get there, for many of them perish in the stormy weather they meet with (49) . In the spring of the following year they (50) the long and tiring journey back to Britain. They return to the identical barn or tree in the (51) district which they had left the (52) autumn. How do these birds find their (53) there and back over such vast distances? Nobody knows exactly (54) , but it has something to do (55) winds and air currents.

单选题What's done is done. It's no use ______ anyone for it.[A] blame[B] blaming[C] to blame[D] to be blaming

单选题Peter ______ TV with Tom this time yesterday.

单选题WhydidthemanNOTwantmoreicecream?

单选题The word perfectionists(Line 1,Para. 3)refers to those who ______.

单选题We arrived at the station ______ late, or we ______ the bus.A. too much; would catchB. a little too; had caughtC. much too; would have caughtD. too much; would have caught