单选题It is obvious that metals in ______ use are very important in our life.

单选题Some people believe that since oil is scarce, the ______ of the motor industry is uncertain.

单选题He is ______ dark glasses to protect his eyes from the sun.

单选题(A) When doctors need information about what dose of medicine to prescribe, they usually consult a fat blue book called the Physicians" Desk Reference, or PDR. But the doses recommended in the PDR may be too high for many people and may cause bad reactions, ranging from dizziness (头晕) and nausea(恶心)all the way to death, according to an article published last month in the journal Postgraduate Medicine. For many drugs, smaller doses would work just as well, with far less risk of bad reactions, said the author, Jay Cohen, an associate professor at the University of California. "Side effects drive a lot of people out of treatment that they need," Dr. Cohen said. "People often gave up trying to treat their illnesses when they found that the cure was worse than the disease. But if doctors were to individualize doses for each patient, more people might take their medicine. " Dr. Cohen said he became aware of the problem because he met many patients who suffered from side effects even though they had taken what were supposedly the correct doses of medicine. When Dr. Cohen consulted medical journals and textbooks, he discovered studies showing that many patients were helped by smaller than usual amounts of medicine. And many of his own patients did better with reduced doses. Dosing guidelines generally tend to be too high because they are based on studies conducted with limited numbers of patients by drug companies when they are seeking approval for new products, Dr. Cohen said. For those studies to run efficiently, doses need to be high enough to show as quickly as possible that the drug works. But later, after the drug is approved, far more people take it, sometimes along with other drugs, and individual differences begin to show up. That information does not always make it into the PDR, Dr. Cohen said. Dr. Cohen cautioned that patients should not try to change doses of prescription on their own. He said they needed to work with doctors to adjust the doses safely.

单选题Some people say that seals are the fairies of the sea and should not be killed. The seals are the cleverest creatures that have ever been found in the sea. "In the Kingdom of the Seals" is an English fairy story by Donald A. Mackenzie, which tells of a seal hunter who wounds a seal. The seal swims away with the hunter"s knife still in its back. That evening a stranger on a black horse calls at the home of the seal hunter and takes him to the edge of a cliff. Suddenly the seal hunter finds himself falling. He falls to the bottom of the sea. The stranger changes into a seal and leads him towards a huge underwater palace. Inside the palace he sees an old grey seal lying on a bed in terrible pain. Beside the bed is a knife, which the hunter recognizes as his own. He is ashamed of his cruelty and begs forgiveness of the old seal. Soon the wound is healed when the seal hunter lays his hand on it and wishes. The old seal regains his strength straight away. The seal hunter promises never to hunt seals again. Then he is led back to dry land. When he gets home he finds his pockets are filled with pearls. In reality, true seals are earless. There are 18 species of careless seals. Fur seals are not true seals. Fur seals feed mainly on a small type of shrimp. When diving for food seals have been known to reach depth of 300 meters, but throughout the breading season of several weeks, male seals do not eat or drink.

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单选题60% of those ______ in the research thought the noise levels of the traffie had increased.

单选题Living here at the top of the mountain with no one else near, the old man must be very ______.

单选题Ask three people to look out the same window at a busy street corner and tell you what they see. Chances are you will receive three different answers. Each person sees the same scene, but each perceives something different about it. Perceiving goes on in our minds. Of the three people who look out the window, one may say that he sees a policeman giving a motorist a ticket. Another may say that he sees a rush-hour traffic jam at the intersection. The third may tell you that he sees a woman trying to cross the street with four children in tow. For perception is the mind"s interpretation of what the senses—in this case our eyes—tell us. Many psychologists today are working to try to determine just how a person experiences or perceives the world around him. Using a scientific approach, these psychologists set up experiments in which they can control all of the factors. By measuring and charting the results of many experiments, they are trying to find out what makes different people perceive totally different things about the same scene.

单选题If you ______ your friends, you may lose them.

单选题When I think 1 to my schooldays, I have very mixed memories. On 2 one hand, I have many very pleasant memories of my classmates and some of my classes, for 3 Science and P.E. 4 , on the 5 hand, I have very 6 memories of some of my teachers, especially of my maths teacher. He was an old man 7 had been teaching for 8 least 35 years and he had old-fashioned ideas 9 teaching. He never let students 10 any of the problems. We had to be silent in class all 11 time. He 12 to punish anybody who got an answer wrong 13 hitting him with a long wooden ruler. It really hurt! He 14 be in trouble if he was still a teacher now 15 it is illegal to hit students. I don"t think he could manage to control the class now as his classes were really 16 . These days teachers must motivate students by 17 them in what they are teaching 18 than by punishing them. Still, 19 some of my memories are not very pleasant, I think I enjoyed my childhood. I managed to get into university so my school 20 not have been so bad.

单选题He has spent a large ______ of money with no results.

单选题John is very ______ —if he promises to do something he"ll do it.

单选题The building ______ over there will be the largest laboratory in our university. A. be built B. being built C. built D. is being built

单选题The climate in Australia is generally ______.

单选题The old lady is said ______ on her way back home from the bank.

单选题______ made the school proud was ______ more than 90% of the students had been admitted to key universities.

单选题It is essential that we ______ measure to protect the ozone layer.

单选题The Caspian Sea, a salt lake, is ______ any other lake in the world.

单选题The little boy ______ his bike and broke his right leg.