单选题She could only see the ______ of the trees.A. outlineB. generalC. edgeD. outlook

单选题 Which of the following sentences does NOT contain subjunctive mood?

单选题He is believed to have been shot by a rival gang in ______ for the shootings last week.

单选题Agriculture was a step in human progress ______ subsequently there was nothing comparable until our own machine age.

单选题Fast cars need no longer be harshly sprung; Honda, Mazda and Mercedes-Benz have all rid themselves of the______ ride that used to be inseparable from good road holding.

单选题The discussion was so ______ that at intervals the speakers stopped for refreshments.

单选题In ancient times, the practice of making noise was meant ______.

单选题Despite the wonderful acting and well-developed plot the ______ movie could not hold our attention. A. three-hours B. three-hour C. three-hours' D. three-hour' s

单选题 Learning is an essential process for living things to acquire necessary skills and behaviors. Scientists have already found that there is a critical period for learning in man and animals. Once the right time for learning a skill or a certain behaviors has passed, this skill or behavior can never be properly learned. That we speak our own language perfectly and the languages we learn later imperfectly also depends on learning this skill at the right time. The brain develops in such a way that it is ready to learn to speak between the ages of about ten months and ten years. Languages learned later are not spoken perfectly. The ability to speak a language is a mixed motor and sensory skill. It is necessary to hear all the sounds, the subtle differences between similar but not identical sounds, the rhythm and tone of the language. One has also to work tongue, throat, and lips to control breathing. All this has to be managed at one and the same time. From some time after birth until the age of six or seven, normal children all learn this perfectly, and without much difficulty they can learn two or even three languages at the same time, without confusing one with the other. But later, most of us cannot acquire this skill. We may learn to write and read the new language perfectly, but to acquire the right accent and the ability to speak so that no one can detect that the language is not our mother tongue hardly ever occurs. But those of us who still want to learn foreign languages after these early milestones have been passed need not worry, for though we may not learn to speak a new language like the natives, we know from thousands of examples that we can go on learning languages beyond the age of eighty. There are so many activities adding up to the simple word 'learning' that although some of the processes become less efficient with ageing of the brain, our actual experience of learning helps us in learning new materials. Normal social and emotional development probably also needs the correct stimulating at the right time. We can observe evidence of this in those rare cases of children who have been completely neglected from birth. Sometimes illegitimate children in the country are put away in barns to conceal their existence from the neighbors. They are taught nothing, not even to be house-trained or to speak. These children then grow up mentally defective. Even if they are found and rescued by the age of four or five, it is too late. Though they can be taught a lot, their speech is always inadequate and their brains never reach the standards of their brothers or sisters.

单选题The role of governments in environmental management is deficit but inescapable. Sometimes, the state tries to manage the resources it owns, and does so badly. Often, (1) , governments act in an even more harmful way. They actually subsidize the exploitation and (2) of natural resources. A whole (3) of policies, from farm-price support to protection for coal-mining, do environmental damage and often (4) no economic sense. Making good policies offers a two-fold (5) : a cleaner environmentpolilicians and a more efficient economy. Crowth and environmentalism can actually go hand in hand, if politicians have the courage to (6) the vested interest that subsidies create. No activity affects more of the earth's surface than farming, h shapes a third of the planet's land area, not (7) Antarctica, and the proportion is rising. World food output per head has risen by 4 percent between the 1970s and 1980s mainly as a result of increases in (8) from land already in (9) , but also because more land has been brought under the plough. Higher yields have been achieved by increased irrigation, better crop breeding, and a (10) in the use of pesticides and chemical fertilizers in the 1970s and 1980s. All these activities may have (11) environmental impacts. For example, land clearing for agrieuhure is the largest single (12) of deforestation; chemical fertilizers and pesticides may (13) water supplies; more intensive farming and the abandonment of fallow periods (14) worsen soil erosion; and the spread of monochord and use of high-yielding varieties of euros have been accompanied by the (15) of old varieties of food plants which might have provided some (16) against pests or diseases in future. Soil erosion threatens the productivity of land in both rich and poor countries. The United States, (17) the most careful measurements have been done, discovered in 1982 that about one-fifth of its farmland was losing topsoil at a rate (18) to diminish the soil's productivity. The country subsequently (19) a program to convert 11 percent of its cropped land to meadow or forest. Topsoil in India and China is (20) much faster than in America.

单选题Make up your mind that whatever the short-term temptations may be, you will never ______ from the highest standards of honor.

单选题Because Edgar was convinced of the accuracy of this fact, he ______ his opinion. A. struck at B. strove for C. stuck to D. stood for

单选题Jane: Hello Sally. Fancy meeting you here! Sally: Hello, Jane. Haven't seen you for a long time. You've got married, haven't you? Jane: Yes, I have. I got married four years ago. Sally: ______.

单选题Mrs. Smith didn't call the police because ______.

单选题In Papusek's experiment babies make learned movements of the head in order to ______. ( )

单选题I am feeling sick, I ______ so much chocolate.

单选题下面的短文后列出了10个句子，请根据短文的内容对每个句子作出判断：如果该句提的是正确信息，选择A；如果该句提供的是错误信息，选择B；如果该句的信息文中没有提及，选择C，并将所选答案的代码（指A、B或C）填在答题纸的相应位置上。Red Nose Day　　Red Nose Day （RND） is a well-known event in the UK.The aim of the clay is

单选题Areas where students have particular difficulty have been treated ______ particular care.

单选题Had I known her name, ______.