单选题The young parrot (is) totally (dependence) on (parental) care after (hatching).A. isB. dependenceC. parentalD. hatching

单选题There are some earth phenomena you can count on, but the magnetic field, some say, is not one of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years undergoes a dramatic polarity reversal—a period when north pole becomes south pole and south pole becomes north pole. But how is the field generated, and why is it so unstable? Groundbreaking research by two French geophysicists promises to shed some light on the mystery. Using 80 metres of deep sea sediment (沉淀物) core, they have obtained measurements of magnetic-field intensity that span 11 polarity reversals and four million years. The analysis reveals that intensity appears to fluctuate with a clear, well-defined rhythm. Although the strength of the magnetic field varies irregularly during the short term, there seems to be an inevitable long-term decline preceding each polarity reversal. When the poles flip—a process that takes several hundred thousand years—the magnetic field rapidly regains its strength and the cycle is repeated. The results have caused a stir among geophysicists. The magnetic field is thought to originate from molten (熔化的) iron in the outer core, 3,000 kilometers beneath the earth's surface. By studying mineral grains found in material ranging from rocks to clay articles, previous researchers have already been able to identify reversals dating back 170 million years, including the most recent switch 730,000 years ago. How and why they occur, however, has been widely debated. Several theories link polarity flips to external disasters such as meteor (陨星) impacts. But Peter Olson, a geophysicist at the Johns Hopkins University in Baltimore, says this is unlikely if the French researchers are right. In fact, Olson says intensity that predictably declines from one reversal to the next contradicts 90 percent of the models currently under study. If the results prove to be valid, geophysicists will have a new theory to guide them in their quest to understand the earth's inner physics. It certainly points the direction for future research.

单选题______average must a fellowship student maintain? A．How high B．What high C．How high an D．What a high

单选题It is said that one hundred dollars can hardly ______ one night at a top hotel in Shanghai.

单选题She ______ in the feet on her way home from work.

单选题We have received the remittance, but have to point out that 600 U.S. dollars is still ______.

单选题______ some questions about the bookkeeper's honesty, the company asked him to leave. A. There being B. There be C. Being D. Having

单选题Only a Udecade/U ago it had no modern industry worth speaking of.

单选题The passage wants to ______.

单选题 {{B}}Directions: {{/B}} For each blank in the following passage, choose the best answer from the choices given below. Mark your answer on the {{B}}ANSWER SHEET{{/B}} by drawing with a pencil a short bar across the corresponding letter in the brackets. Most children with healthy appetites are ready to eat almost anything that is offered them and a child rarely dislikes food {{U}}(31) {{/U}} it is badly cooked. The way a meal is cooked and served is most important and an attractively served meal will often improve a child's appetite. Never ask a child{{U}} (32) {{/U}}he likes or dislikes a food and never discuss likes and dislikes in front of him or allow{{U}} (33) {{/U}} else to do so. If the father says he hates fat meat or the mother refuses vegetables, in the child's hearing he is{{U}} (34) {{/U}} to copy this procedure. Take it {{U}}(35) {{/U}} granted that he likes everything and he probably will. Nothing healthful should be omitted from the meal because of a supposed dislike. At meal times it is a good{{U}} (36) {{/U}}to give a child a small portion and let him come back for a second helping rather than give him as {{U}}(37) {{/U}} as he is likely to eat all at once. Do not talk too much to the child{{U}} (38) {{/U}} meal times, but let him get on with his food; and do not{{U}} (39) {{/U}}him to leave the table immediately after a meal or he will soon learn to swallow his food so he can hurry back to his toys. Under{{U}} (40) {{/U}}circumstances must a child be coaxed (哄骗) or forced to eat.

单选题The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents that could have been caused by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic devices such as portable computers, radio and cassette players and mobile telephones. RTCA, an organization which advises the aviation (航空) industry, has recommended that all airlines ban (禁止) such devices from being used during "critical" stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights. The difficulty is predicting how electromagnetic fields might affect an aircraft's computers. Experts know that portable devices emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not. The fact that aircraft may be vulnerable (易受损的) to interference raises the risk that terrorists may use radio system in order to damage navigation equipment. As worrying, though, is the passenger who can't hear the instructions to turn off his radio because the music's too loud.

单选题Waiter: ______? Customer: Yes, I'll have a cheeseburger, medium rare, with French fries. A. What do you want to eat B. Have you decided what to have yet C. Excuse me, are you ready to order now D. Excuse me, but who'd like to order

单选题Some old people don't like pop songs because they can't ______ so much noise.

单选题Picasso was an artist who fundamentally changed the ______ of art for later generations. A. philosophy B. concept C. viewpoint D. theme

单选题The biographer has to dance between two shaky positions with respect to the subject (研究对象). Too close a relation, and the writer may lose objectivity. Not close enough, and the writer may lack the sympathy necessary to any effort to portray a mind, a soul—the quality of life. Who should write the biography of a family, for example? Because of their closeness to the subject, family members may have special information, but by the same token, they may not have the distance that would allow them to be fair. Similarly, a king's servant might not be the best one to write a biography of that king. But a foreigner might not have the knowledge and sympathy necessary to write the king's biography—not for a readership from within the kingdom, at any rate. There is no ideal position for such a task. The biographer has to work with the position he or she has in the world, adjusting that position as necessary to deal with the subject. Every position has strengths and weaknesses, to thrive, a writer must try to become aware of these, evaluate them in terms of the subject, and select a position accordingly. When their subjects are heroes or famous figures, biographies often reveal a democratic motive, they attempt to show that their subjects are only human, no better than anyone else. Other biographies are meant to change us, to invite us to become better than we are. The biographies of Jesus (耶稣) found in the Bible are in this class. Biographers may claim that their account is the "authentic" one. In advancing this claim, they are helped if the biography is "authorized" by the subject; this presumably allows the biographer special access to private information. "Unauthorized" biographies also have their appeal, however, since they can suggest an independence of mind in the biographer. In book promotions, the "unauthorized" characterisation usually suggests the prospect of juicy gossip that the subject had hoped to suppress. A subject might have several biographies, even several "authentic" ones. We sense intuitively that no one is in a position to tell "the" story of a life, perhaps not even the subject, and this has been proved by the history of biography.

单选题I then listened to the boy ______ the lesson written on the blackboard. A. read B. reading C. to read D. having read

单选题During the process, great care has to be taken to protect the ______ silk from damage. A. sensitive B. tender C. delicate D. sensible

单选题Elizabeth (Treading on someone's foot. ): ______ . I hope I haven't hurt you.Jordan: It's all fight.

单选题He came out with such an elaborate excuse that I didn't quite believe him.

单选题The International Olympic Committee (IOC) has launched an investigation into allegations that its officials in more than 50 countries have been selling London Olympics tickets on the black market for profit. The IOC met at an emergency session on Saturday to look into a pile of evidence uncovered by Britain"s Sunday Times newspaper. The paper claims that high-ranking Olympic officials have been selling tickets for the games at hugely inflated prices. The highest priced tickets on the black market were for the men"s 100- meter final. The IOC has issued a statement saying it "takes these allegations very seriously and has immediately taken the first steps to investigate." IOC rules forbid national Olympics committees from selling tickets overseas, increasing ticket prices or selling tickets to unauthorized, third-party resellers. Despite this, Sunday Times undercover reporters posing as illegal ticket sellers say they have recorded evidence of 27 officials selling tickets distributed to 54 countries. One of the most serious allegations was against the Greek Olympic Committee president Spyros Capralos. He denies saying he had "pulled strings" with the head of the London Olympics Sebastian Coe even though the paper posted videos of its reporters" negotiations with Capralos on its website. Mr Capralos has so far refused to comment.