单选题It was his nervousness in the interview what probably caused him to lose the job.

单选题Don"t ______ the camera ______ unless you are sure you can put it together.

单选题The increased use of computers in business has been ______ by a costly increase in computer crime.

单选题--When will you be back? --I'll be back ______ a couple of days.

单选题The teacher asked __________ who had finished their homework to leave the classroom as quietly as they could．

单选题My father has classes ______ day: Mondays, Wednesdays and Fridays. A. each other B. every other C. this and the other D. all other

单选题Penguins live together in large and busy colonies. Every pair has a little piece of ground. When a penguin wants to walk through his neighbor's ground he must ask for permission. If he does not, he will have to fight. Penguins come and go all day. They fight, fish and look after their children. (33) All penguins are good parents--the emperor penguins are perhaps the best parents in the world. They walk in from the sea in the middle of the dark Antarctic winter. They choose their wives in the dark. They can only hear them--not see them. Then the females lay their eggs and go away for two months. The males look after the eggs. They hold them on their feet inside a fold of skin. If the eggs get cold there will be no chicks. There is no food. The snow falls. The wind blows-sometimes at 150 kilometers an hour. The penguins do not move. When the females return from the sea they will not remember their husbands. It does not matter. Only one thing matters-the eggs. Emperor penguins never fight-unless a penguin leaves a chick for a minute. Then they fight because they all want it. They are strange and wonderful birds.

单选题Hospital doctors don"t go out very often as their work ______ all their time.

单选题The reason that many of homemakers buy kitchen appliances (厨房用品) is that they want to do their tasks in a shorter length of time. A. that B. many of homemakers C. that D. in a shorter length of time.

单选题It's high time we ______ something to stop traffic accidents.

单选题I'd like to ______ your offer of a ride into town.

单选题When we talk about intelligence, we do not mean the ability to get good scores on certain kinds of tests or even the ability to do well in school. By intelligence, we mean a way of living and behaving, especially in a new or upsetting situation. If we want to test intelligence, we need to find out how a person acts instead of how much he knows what to do. For instance, when in a new situation, an intelligent person thinks about the situation, not about himself or what might happen to him. He tries to find out all he can, and then he acts immediately and tries to do something about it. He probably isn"t sure how it will all work out, but at least he tries. And, if he can"t make things work out right, he doesn"t feel ashamed that he failed; he just tries to learn from his mistakes. An intelligent person, even if he is very young, has a special outlook on life, a special feeling about life, and knows how he fits into it. If you look at children, you"ll see a great difference between what we call "bright" children and "not-bright" children. They are actually two different kinds of people, not just the same kind with different amount of intelligence. For example, the bright child really wants to find out about life-he tries to get in touch with everything around him. But, the unintelligent child keeps more to himself and his own dream-world; he seems to have a wall between him and life in general.

单选题—What color do you want to use to paint the house? —I would like the house ______ white.A. paintedB. paintingC. to paintD. having been painted

单选题______ you were busy, I wouldn"t have bothered you with my questions.

单选题If you suspect that illness might be serious, you should not ______ going to the doctor.

单选题Do you think there would be less conflict in the world if all people ______ the same language?

单选题Elephants are perhaps the only animals that are hunted for their teeth. Elephant tusks, or very large teeth growing on either side of their mouths, are composed of a valuable material called ivory(象牙). An elephant uses its long, pointed tusks as tools for digging in the ground for food. He also uses them as weapons in combat. The tusks of male elephants are usually large and heavy. In Africa, female elephants have long, light tusks. In India and other parts of southern Asia, female elephants have small, short tusks or none at all. Tusks in good condition are in great demand, and may sell for as high as two thousand dollars or more. Because of this, large numbers of elephants have been killed. Some countries have initiated (开始) methods to protect elephants. They have established elephant preserves, areas of land set aside for herds of elephants where no one is allowed to harm them. Elephants on the preserves are safe from ivory hunters.