单选题Living in different cities, Linda and Lisa are still intimate friends.

单选题Hundreds of years ago cloves were used to Uremedy/U headaches.

单选题This reminds me of lots of things.

单选题It is possible to approach the problem in a different way.

单选题We can no longer {{U}}put up with{{/U}} his actions

单选题Nurses should give reassurance that Usecrecy/U will be maintained.

单选题After supper we usually take a Ustroll/U around the park for about an hour.

单选题He Upondered/U her words thoroughly.

单选题These programmes are of immense value to old people. A. natural B. fatal C. tiny D. enormous

单选题The dominant theme in the music is of tranquility and peacefulness.

单选题This table is strong and durable .

单选题Wind energy has been praised as cost-effective to produce clean energy as well as jobs. That promise, along with new government subsidies (补贴), has helped wind turbines (涡轮机) pop up on hills and fields throughout America. But not every environmentalist is happy about that development. Critics charge that wind-energy development can cause habitat fragmentation-a displacement of a species that can eventually reduce its numbers-as well as the deaths of birds and bats (a species that is especially vulnerable due to its low reproductive rates) that collide with the wind turbines' massive blades. A 2007 study by the National Academy of Sciences puts the number of birds killed each year at about 20,000 to 30,000. That's a low estimate, says Michael Fry of the American Bird Conservancy. According to his group, turbines kill three to 11 birds per megawatt of wind energy they produce. According to critics, wind-energy development may causeA. the deaths of 20,000 to 30,000 birds.B. distinction of many species in the area.C. habitat fragmentation and deaths of birds.D. environment recovery from destruction.

单选题After reading this passages you probably have got the impression that

单选题14 This is not typical of English, but is a feature of the Chinese language. A．particular B．characteristic C．remarkable D．idiomatic

单选题Adaptation of Living Things Certain animals and plants develop characteristics that help them cope with their environment better than others of their kind. This natural biological process is called adaptation. Among the superior characteristics developed through adaptation are those that may help in getting food or shelter, in providing protection, and in producing and protecting the young. That results in the evolution of more and more organisms (微生物) that are better fitted to their environments. Each living thing is adapted to its way of life in a general way, but each is adapted especially to its own distinct class. A plant, for example, depends upon its roots to fix itself firmly and to absorb water and inorganic (无机的) chemicals. It depends upon its green leaves for using the sun"s energy to make food from inorganic chemicals. These are general adaptations, common to most plants. In addition, there are special adaptations that only certain kinds of plants have. Many animals have adaptations that help them escape from their enemies. Some insects are hidden by their body color or shape, and many look like a leaf or a little branch. The coats of deer are colored to mix with the surroundings. Many animals have the ability to remain completely still when an enemy is near. Organisms have a great variety of ways of adapting. They may adapt in their structure, function, and genetics; in their development and production of the young; and in other respects. An organism may create its own environment, as do warm-blooded mammals (哺乳动物), which have the ability to adjust body heat exactly to maintain their ideal temperature despite changing weather. Usually adaptations are an advantage, but sometimes an organism is so well adapted to a particular environment that, if conditions change, it finds it difficult or impossible to readapt to the new conditions.

单选题 下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。{{B}}第一篇{{/B}} Radiation Effect Space is a dangerous place, not only because of meteors (流星)but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth light, gets through, and this is essential for plants to make the food that we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation, but their spacesuits or the walls of their spacecrafts, if they are inside, do prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem" (“雷姆”). Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged, the figure of 60 reins has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage-a person may feel perfectly well, but the cells of his or her sex organs may be damaged ,and this will not be discovered until the birth of deformed(畸形的)children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, the Apollo crew accumulated a larger amount of reins. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage clone by radiation ,but no really effective ones have been found so far.

单选题He demolished my arguments in minutes.

单选题Who is the head of this delegation?

单选题The food is {{U}}inadequate{{/U}} for ten people.

单选题He was {{U}}weary{{/U}} of the constant battle between them. A. fond B. proud C. tired D. afraid