单选题The Sun Dance is considered by many to be the most spectacular ritual of the North American Plains Indians. A．ceremony B．ancestor C．scene D．costume

单选题A great deal has been done to remedy the situation.

单选题He {{U}}resented{{/U}} being called a foreigner.

单选题He is quite sure that it's {{U}}absolutely{{/U}} impossible for him to fulfil the task within two days.

单选题The word "Sunset" in the title of this novel most probably means

单选题In the latter case the outcome can be serious indeed. A. result B. judgment C. decision D. event

单选题Wet clays can be easily molded into a form that they retain.

单选题Loud noises can be irritating. A. hateful B. painful C. stimulating D. annoying

单选题Even in a modernized country, manual work is still needed. A. hard B. mental C. simple D. physical

单选题The symptoms of the disease Umanifested/U themselves ten days later.

单选题These are our motives for doing it.A. reasonsB. argumentsC. targetsD. pursuit

单选题This kind of animals are on the verge of Uextinction/U, because so many are being killed for their fur.

单选题There is a growing gap between the rich and the poor.

单选题At the end of the passage the author suggests that A. it is impossible for life to exist on other planets. B. earthlike life could only exist on a few planets. C. life could exist on only one planet in a million. D. life could exist on a great number of planets.

单选题What were the {{U}}effects{{/U}} of the decision she made?

单选题Don't Count on Dung "Conservationists(自然保护主义者)may be miscalculating the numbers of the threatened animals such as elephants, " say African and American researchers. The error occurs because of a flaw in the way they estimate animal numbers from the piles of dung(粪)the creatures leave behind. The mistake could lead researchers to think that there are twice as many elephants as there really are in some regions according to Andrew Plumptre of the Wildlife Conservation Society(WCS) in New York. Biologist Katy Payne of Cornell University in Ithaca, New York, agrees. "We really need to know elephant numbers and the evidence that we have is quite indirect, "says Payne, who electronically tracks elephants Counting elephants from planes is impossible in the vast rainforests of Central Africa. So researchers often estimate elephant numbers by counting dung piles in a given area. They also need to know the rate at which dung decays because it's extremely difficult to determine these rates. However, researchers counting elephants in one region tend to rely on standard decay rates established elsewhere. "But researchers at the WCS have found that this decay rate varies from region to region depending on the climate and environment. Using the wrong values can lead the census astray(离开正道)," says Plumptre. He and his colleague Anthony Chifu Nchanji studied decaying elephant dung in the forests of Cameroon. They found that the dung decayed between 55 and 65 per cent more slowly than the dung in the rainforests of neighbouring Gabon. If researchers use decay rates from Gabon to count elephants in Cameroon, they would probably find more elephants than are actually around. "This could mean estimates in Cameroon are at least twice as high as those derived from decay rates calculated locally," says Plumptre "However accurate your dung density estimate might be the decay rate can severely affect the result." Plumptre also says that the dung-pile census should be carried out over a region similar in size to an elephant's natural range. The usual technique of monitoring only small, protected areas distorts numbers because elephants move in and out of these regions, he says" If the elephant population increases within the protected area, you can not determine whether it is a real increase or whether it is due to elephants moving in because they are being poached(入侵偷猎)outside. " Plumptre says that similar problems may also affect other animal census studies that rely on indirect evidence such as nests, tracks or burrows(地洞).

单选题Some insects rely on the tiny hairs scattered over their bodies to sense sound waves.

单选题The Beginning of American Literature American has always been a land of beginnings. After Europeans "discovered" America in the fifteenth century, the mysterious New World became for many people a genuine hope of a new life, an escape from poverty and persecution, a chance to start again. We can say that, as nation, America begins with that hope . When, however, does American literature begin? American literature begins with American experiences. Long before the first colonists arrived, before Christopher Columbus, before the Northmen who "found" America about the year 1,000, native Americans lived here. Each tribe"s literature was tightly woven into the fabric of daily life and reflected the unmistakably American experience of lining with the land. Another kind of experience, one filled with fear and excitement, found its expression in the reports that Columbus and other explorers sent home in Spain, French and English. In addition, the journals of the people who lived and died in the New England wilderness tell unforgettable tales of hard and sometimes heartbreaking experiences of those early years. Experience, then, is the key to early American literature. The New World provided a great variety of experiences, and these experiences demanded a wide variety of expressions by an even wider variety of early American writers. These writers included John Smith, who spent only two-and-a-half years on the American continent. They included Jonathan Edwards and William Byrd, who thought of themselves as British subjects, never suspecting a revolution that would create a United States of America with a literature of its own. American Indians, explorers, Puritan ministers, frontier wives, plantation owner—they are all the creators of the first American literature.

单选题She {{U}}persevered{{/U}} in her ideas despite obvious objections raised by friends.

单选题Don't try to interrupt while others are talking.A. cut downB. cut inC. cut upD. cut off