单选题The purpose of the passage is to _____

单选题He must have stayed up late last night, ____ he?

单选题The word "deter" in the last paragraph probably means ______

单选题According to the passage, Italians ______.

单选题You must be aware that the terms and conditions of a contract once ______ should be strictly ______ , failure to abide by them will mean violation of contract. A．signing, observed B．signed, observing C．signed, observed D．signing, observing

单选题All______of the world carry on breeding experiments to increase yield or to improve disease resistance.

单选题The doctor______a medicine for my headache.

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Man: Why, you have to ask your parents to pay your rent? Women: Well, I am unable to make ends meet. Question: What do we know about the woman?

单选题According to one belief, if truth is to be known it will make itself apparent, so one ______ wait instead of searching for it. A. would rather B. had to C. cannot but D. had best

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

单选题People do not analyse every problem they meet. Sometimes they try to remember a solution from the last time they had a 21 problem. They often accept the opinion or ideas of other people. Other times they begin to act without (22) ; they try to find a solution by trial and error. However, when all of these methods (23) , the person with a problem has to start analysing. There are six (24) in analysing a problem. (25) , the person must recognize that there is a problem. For example, Sam' s bicycle is broken, and he cannot ride it to class as he usually does. Sam must (26) that there is a problem with his bicycle. Next the person must (27) the problem. Before Sam can repair his bicycle, he must know why it does not work. For example, he must (28) the parts that are wrong. Now the person must look for (29) that will make the problem clearer and lead to (30) solutions. For example, suppose Sam (31) that his bike does not work because there is something wrong with the brakes. (32) , he can look in his bicycle repair book and read about brakes, talk to his friends at the bike shop, or look at his brakes carefully. After (33) the problem, the person should have several suggestions for a possible solution. Take Sam as an example (34) , his suggestions might be tighten or loosen the brakes; buy new brakes and change the old ones. In the end, one (35) seems to be the solution to the problem. Sometimes the final idea comes quite unexpectedly because the thinker suddenly sees something in a different way. Finally the solution is tested. Sam does it and finds his bicycle works perfectly. In short he has solved the problem.

单选题 The technology revolution may be coming to poor countries via the mobile phone, not the personal computer, as it did in rich ones. And just as the Internet encouraged an entrepreneurial philosophy, and with it the creation of a few too many dotcom firms, Africa's surge in mobile-phone use may {{U}}unleash{{/U}} the same sort of business energy, but tailored to local needs. One such initiative is about to begin. TradeNet, a software company based in Accra, Ghana, will unveil a simple sort of eBay for agricultural products across a dozen countries in West Africa. It lets buyers and sellers indicate what they are after and their contact information, which is sent to all relevant subscribers as an SMS text message in one of four languages. Interested parties can then reach others directly to do a deal. Listing offers is free, as is receiving the texts. TradeNet plans to earn revenue by putting advertisements in the messages, though it hopes the service will become so useful that recipients will eventually want to pay. For the moment, though, the company is busy signing up users and swallowing the cost of sending the messages. Mobile-phone use in sub-Saharan Africa is soaring. Whereas only 10% of the population had network coverage in 1999, today more than 60% have it, a figure expected to exceed 85% in the coming year, according to the GSM Association, an industry trade group. This provides the infrastructure for businesses like TradeNet to function. TradeNet is the brainchild of Mark Davies, a British dotcom tycoon who gave up the rat race and went to Africa in 2000. In 2005, he started the prototype for TradeNet using around ＄600,000 of his own money and about ＄200,000 from aid agencies. An early set of trials last year generated a surplus of trades, such as a sale of organic fertilizer between a person in Yemen and another in Nigeria. A number of other mobile-phone market-places taking shape also started as aid projects. For example, Trade at Hand, a project funded by the UN's International Trade Centre in Geneva, provides daily price information for fruit and vegetable exports in Burkina Faso and Mali, with plans to add more countries. And Manobi, a telecoms firm based in Senegal, providing real-time agricultural and fish prices to fee-paying subscribers, is also backed by aid money. But TradeNet's approach is unique so far because it collects valuable economic data-names, locations, business interests and telephone numbers-and then sells them to advertisers. The price of economic development may be junk mail by mobile phone.

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

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

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.