单选题Cancer should be considered to be a biological problem rather than a medical one because ______. A. viruses are known to cause cancer in animals B. at present, human cancer is not believed to be contagious(传染的) C. there are many known causes for the transformation of a normal cell to a cancer cell D. results of experiments on plants and animals do not vary greatly from species to species

单选题Only when faced with overwhelming evidence of being treated differently than the men who surrounded me______, briefly, with the notion that I was different in gender-related ways from my male colleagues.

单选题Here are some toys. You can ______ one or two for your little son as a birthday present.

单选题My brother said he ______ told his examination results by the time I next saw him.

单选题Although based on an actual event, the film lacks ______: the director shuffles events, simplifies the tangle of relationships, and ______ documentary truth for dramatic power. A. conviction, embraces B. expressiveness, exaggerates C. verisimilitude, sacrifices D. realism, substitutes

单选题Dogs are social animals and without proper training, they will behave like wild animals. They will spoil your house, destroy your belongings, bark excessively, fight other dogs and even bite you. Nearly all behavior problems are perfectly normal dog activities that occur at the wrong time or place or are directed at the wrong thing. The key to preventing or treating behavior problems is learning to teach the dog to redirect its normal behavior to outlets that are acceptable in the domestic setting. One of the best things you can do for your dog and yourself is to obedience train (驯服) it. Obedience training doesn't solve all behavior problems, but it is the foundation for solving just about any problem. Training opens up a line of communication between you and your dog. Effective communication is necessary to instruct your dog about what you want it to do. Training is also an easy way to establish the social rank order. When your dog obeys a simple request of "come here, sit," it is showing obedience and respect for you. It is not necessary to establish yourself as top dog or leader of the dog pack (群) by using extreme measures. You can teach your dog its subordinate (从属的) role by teaching it to show submission to you. Most dogs love performing tricks for you to pleasantly accept that you are in charge. Training should be fun and rewarding for you and your dog. It can enrich your relationship and make living together more enjoyable. A well-trained dog is more confident and can more safely be allowed a greater amount of freedom than an untrained animal.

单选题Formulated in 1823 ,the Monroe Doctrine {{U}}asserted{{/U}} that, he Americas were no longer open to European colonization.

单选题Although another company has offered her a high salary, she is ______ to leave the present job. A) willing B) reluctant C) hesitant D) determined

单选题According to a survey, which was based on the responses of over 188,000 students, today's traditional-age college freshmen are "more materialistic and less altruistic(利他主义的)"than at any time in the 17 years of the poll. Not surprising in these hard times, the student's major objective "is to be financially well off. Less important than ever is developing a meaningful philosophy of life". It follows then that today the most popular course is not literature or history but accounting. Interest in teaching, social service and the "altruistic" fields is at a low. On the other hand, enrollment in business programs, engineering and computer science is way up. That's no surprise either. A friend of mine (a sales representative for a chemical company) was making twice the salary of her college instructors her first year on the job--even before she completed her two-year associate degree. While it's true that we all need a career, it is equally true that our civilization has accumulated an incredible amount of knowledge in fields far removed from our own and that we are better for our understanding of these other contributions--be they scientific or artistic. It is equally true that, in studying the diverse wisdom of others, we learn how to think. More important, perhaps, education teaches us to see the connections between things, as well as to see beyond our immediate needs. Weekly we read of unions who went on strike for higher wages, only to drive their employer out of business. No company; no j0b. How shortsighted in the long run! But the most important argument for a broad education is that in studying the accumulated wisdom of the ages, we improve our moral sense. I saw a cartoon recently which shows a group of businessmen looking puzzled as they sit around a conference table; one of them is talking on the intercom (对讲机): "Miss Baxter," he says, "could you please send in someone who can distinguish right from wrong?" From the long-term point of view, that's what education really ought to be about.

单选题I would appreciate it______you help me with my English.

单选题He is not ______ to teach the postgraduates. A) compact B) complete C) competent D) conflicting

单选题Although he has become rich, he is still very______of his money.

单选题_______ , we went swimming in the lake.

单选题Many of the problems we face today are not so new as we think they are. And some of our modern solutions are not so new, either. The problem of energy shortages and the solution of using solar energy go back at least to early Greek cultures. The climate in the coastal areas of Greece 2,500 years ago was characterized by cool winters, much as it is today. At that time, the Greeks heated their homes with small, charcoal-burning heaters. In other words, wood (which is used to make charcoal) was their primary source of energy. However, by the fifth century B C fuel shortages had become common be- cause, in many parts of Greece, the firewood in the forests had been depleted. Once the supply of fire- wood from the local forests ran out, people began to use the wood from olive groves as fuel. But this solution had its own problem. It reduced the olive crop, a valuable resource to the Greeks. By the fourth century B C, the city of Athens banned the use of olive wood for fuel. Wood had to be imported from farther and farther away, making it more difficult to obtain and more expensive to use. About this time the Greeks began to build their houses facing south, so that the low sun in winter could penetrate and help heat the interiors. Excavations of ancient Greek cities suggest that large areas were planned so that individual homes could take maximum advantage of passive solar energy.

单选题Man: It seems the restaurants here have little business these days. Woman: That's true. But ours is a scenic resort. And this is not the busy season. When summer comes, you'll see armies of tourists waiting in line in order to get a seat. Question: What do we learn from the conversation about the restaurants in the town? A. They stay closed until summer comes. B. They cater chiefly to tourists. C. They are busy all the year around. D. They provide quality service to their customers.

单选题Which of the following are not expected within the next 5 years?

单选题Noting the murder victim's flaccid musculature and pear-like figure, she deduced that the unfortunate fellow had earned his living in some ______ occupation.

单选题9 is the ______ of 3 multiplied by 3. A．homework B．meet C．product D．print