题目内容
问：王涛和小丽为什么会发生那样的事情？（）
查看答案
搜索结果不匹配？点我反馈
更多问题
Section C The sea is the largest unknown part of our world. It covers (36) percent of the earth. There is still much to be discovered about this (37) blanket of water. Some scientists are studying ways of bringing the ocean’s huge (38) of water to the deserts of the world. Others hope to control the weather by learning more about the (39) of heat and moisture between the ocean and the air. Others, are studying the ways in which sound travels and is (40) by water and heat. What happens when seawater touches different elements is another (41) of study. (42) the ocean floor is an important work among so many interesting studies. (43) , only a very small part of the ocean has been mapped. Now underwater photography is used in mapping parts of the ocean floor. (44) . If the waters of the ocean could be moved away, the sea floor with its wide valleys, uneven mountains would be an unbelievable sight. Around the edges of the continents the ocean floor is flat and the water is not much deeper than about thirty miles. (45) . But where there are high young mountains along the coast, this flat part may be much less than thirty miles. (46) .
Passage Two Being a man has always been dangerous. There are about 105 males born for every 100 females, but this ratio drops to near balance at the age of maturity, and among 70-year-olds there are twice as many women as men. But the great universal of male mortality is being changed. Now boy babies survive almost as well as girls do. This means that, for the first time, there will be an excess of boys in those crucial years when they are searching for a mate. More important, another chance for natural selection has been removed. Fifty years ago, the chance of a baby (particularly a boy baby) surviving depended on its weight. A kilogram too light or too heavy meant almost certain death. Today it makes almost no difference. Since much of the variation is due to genes, one more agent of evolution has gone. There is another way to commit evolutionary suicide: stay alive, but have fewer children. Few people are as fertile as in the past. Except in some religious communities, very few women have 15 children. Nowadays the number of births, like the age of death, has become average. Most of us have roughly the same number of offspring. Again, differences between people and the opportunity for natural selection to take advantage of it have diminished. India shows what is happening. The country offers wealth for a few in the great cites and poverty for the remaining tribal peoples. The grand mediocrity of today everyone being the same in survival and number of offspring means that natural selection has lost 80% of its power in upper-middle-class Indian compared with other tribes. For us, this means that evolution is over; the biological Utopia has arrived. Strangely, it has involved little physical change. No other species fills so many places in nature. But in the past 100,000 years--even the past 100 years--our lives have been transformed but our bodies have not. We did not evolve, because machines and society did it for us. Darwin had a phrase to describe those ignorant of evolution; they "look at an organic being as a savage looks at a ship, as at something wholly beyond his comprehension". No doubt we will remember a 20th century way of life beyond comprehension for its ugliness. But however amazed our descendants may be at how far from Utopia we were, they will look just like us. Which of the following is most probably the best title for the passage
_______________________(通过使用卫星辅助的全球定位系统，汽车里的计算机能给汽车精确定位)；and with the application of sensors, smart cars can eliminate most car accidents.
Section BPassage One Unlike the scientist, the engineer is not free to select the problem which interests him；he must solve the problems as they arise, and his solutions must satisfy conflicting requirements. Typically, the engineering solution to most problems must take into account many factors. To the engineer, efficiency means output divided by input. His job is to secure a maximum output for a given input or to secure a given output with a minimum input. The ratio may be expressed in terms of energy, materials, money, time, or man. Most commonly the denominator (分母) is money；in fact, most engineering problems are answered ultimately in dollars and cents. The emphasis on efficiency leads to the large, complex operations which are characteristic of engineering. The processing of the new antibiotic and vaccines in the test-tube stage belongs in the field of biochemistry, but when great quantities must be produced at low cost, it becomes an engineering problem. It is the desire for efficiency and economy that distinguishes ceramic engineering from the work of the potter, textile engineering from weaving, and agricultural engineering from farming. Since output equals input minus losses, the engineer must keep losses and waste to a minimum. One way is to develop uses for products which otherwise would be waste. The work of the chemical engineer in utilizing successively greater fractions of raw materials such as crude oil is well known. Losses due to friction occur in every machine and in every organization. Efficient functioning depends on good design, careful attention to operating difficulties, and lubrication of rough spots, whether they are mechanical or personal. The raw materials with which engineers work are seldom found in useful forms. Engineering of the highest type is required to conceive, design, and achieve the conversion of the energy of a turbulent mountain stream into the powerful torque(转矩) of an electric motor a hundred miles away. Similarly many engineering operations are required to change the sands of the seashore into the precise lenses which permit us to observe the minute bacteria in a drop of water and study a giant mass of stars in outer space. The organization of the last paragraph can be best described as ______.
微信支付 
支付宝支付