单选题"When they drove down into the city centre, they found it was not so peaceful after all!" This means ______.

单选题Even researchers, for example, ______ applying the concept of "cohesion" may not produce the most cost-effective science.

单选题With enough evidence, the young man had to ______ to stealing the jewels.

单选题Both Pingping and Beibei have done ______ homework.A. hisB. herC. theirD. both's

单选题Flexibility, assertiveness, problem solving, and ______ are also valued.

单选题Once environmental damage ______, it takes many years for the system to recover. A. had done B. is to do C. does D. is done

单选题Long-term use of the drug can the patient's personality. A. alter B. switch C. exchange D. substitute

单选题Do you think sitting and studying all the time will improve your grades? Think again. Getting some exercise may help, too. New research with older people suggests that taking regular walks helps them pay attention better than if they didn"t exercise. Previous research had shown that mice learn, remember, and pay attention better after a few weeks of working out on a running wheel. Mice that exercise have greater blood flow to the brain than those who don"t. Their brain cells also make more connections. Neuroscientists from the University at Urbana-Champaign wanted to find out if the same thing is true for people. First, they measured the physical fitness of 41 adults, ages 58 to 77, after each person walked 1 mile. Then, participants looked at arrows on a computer screen and had to use computer keys to show which way one particular arrow was pointing. Adults who were physically fit were faster at the arrow task, and their answers were just as accurate as their less-fit peers, the researchers found. The fitter participants also had more blood flow to a part of their brain responsible for paying attention and making decisions. In a second study, 15 elderly people who completed a 6-month aerobic-training course were faster at attention tasks compared with 14 seniors who just did stretching and toning exercises for the same amount of time. So, even going for a walk every 2 or 3 days for just 10 to 45 minutes can help. That should be good news for your grandparents. The effects of exercising on the brains of younger people haven"t been studied yet. Still, it can"t hurt to take occasional study breaks and go for a walk or run around with your friends. You might even do better in school. Whatever you do, though, don"t try to read and walk at the same time. You could end up hurting yourself!

单选题Writing a letter or reading a book may appear to be ______ activities in which individuals exercise personal skills.

单选题If you ______ that late movie last night，you wouldn't be sleepy. A. haven't watched B. hadn't watched C. didn't watch D. wouldn't have watched

单选题I criticized him, you know, not ______ I hate him but ____ I love him.A. because; becauseB. because; forC. for; becauseD. for; for

单选题As welfare reform has ______ millions of single mothers like Patino into the workforce since 1996, questions about its effects on families have loomed large. A. nudged B. propelled C. divested D. bumped

单选题Lily has no trouble finding the new railway station because she has a good ______ of direction.

单选题The reason why he adapted to the new situations quickly is that he has a ______ attitude.

单选题In which of the following cases is it useful to consider the relationship between the length of an oscillating object and its natural period?

单选题______children have been taken out of school and taught by their parents at home.

单选题Social scientists believe that societies with a_______ of young men without hope of marriage suffer from instability, violence and surges in crime.

单选题{{B}}Directions: There are five reading passages in this part. Each passage is followed by four questions. For each question there are four suggested answers marked A, B, C and D. Choose the best answer and blacken the corresponding letter on the Answer Sheet.{{/B}}{{B}}Passage One{{/B}} A man once said how useless it was to put advertisements in the newspapers. "Last week," said he, "my umbrella was stolen from a London Church. As it was a present, I spent twice its worth in advertising, but didn't get it back." "How did you write your advertisement?" asked one of the listeners, a merchant. "Here it is," said the man, taking out of his pocket a slip cut from a newspaper. The other man took it and read, "Lost from the City Church last Sunday evening, a black silk umbrella. The gentleman who finds it will receive ten shillings on leaving it at No. 10 Broad Street. " "Now," said the merchant, "I often advertise, and find that it pays me well. But the way in which an advertisement is expressed is of great importance. Let us try for your umbrella again, and if it fails, I'll buy you a new one." The merchant then took a slip of paper out of his pocket and wrote: "If the man who was seen to take an umbrella from the City Church last Sunday evening doesn't wish to get into trouble, he will return the umbrella to No. 10 Broad Street. He is well known." This appeared in the paper, and on the following morning, the man was astonished when he opened the front door. In the doorway lay at least twelve umbrellas of all sizes and colors that had been thrown in, and his own was among the number. Many of them had notes, fastened to them saying that they had been taken by mistake, and begging the loser not to say anything about the matter.

单选题The last guests to reach the hotel______ at 12 o' clock at night. A. checked out B. checked up C. checked in D. checked on