MBA习题练习

MBA每日一练（2019/1/9）
第1题：The invention of both labor-saving tools and tools of intelligence is rarely accidental. Instead, it is usually the product of human need; (21) is truly the mother of invention. People usually devise tools to (22) for natural deficiencies. For example, people invented weapons to defend (23) from physically superior (24) .But (25) is only one incentive for inventions. People also invent (26) tools to (27) certain established tasks more efficiently. For instance, people developed the bow and arrow from the (28) spear or javelin in order to shoot (29) and strike with greater strength.
(30) civilizations developed, greater work efficiency came to be demanded, and (31) tools became more (32) .A、tool would (33) a function until it proved (34) in meeting human needs, at which point an improvement would be made. One impetus for invention has always been the (35) for speed and high-quality results--provided they are achieved (36) reasonable costs. Stone pebbles were sufficient to account for small quantities of possessions, (37) they were not efficient enough for performing sophisticated mathematics. However, beads arranged systematically evolved into the abacus. The (38) of this tool can be (39) to the development of commerce in theEast around 3000B、C、, and the abacus is known (40) by the ancientBabylonians,Egyptians,Chinese, etC、
A、inefficientB、effectiveC、adequate D、sufficient
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第2题：设等差数列an满足3a8=5a13且a1＞0，Sn为其前n项之和，则Sn的最大值是()．
A、S10 B、S11 C、S20 D、S21
E、以上结论均不正确
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第3题：The role of governments in environmental management is difficult 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. Scrapping them offers a two-fold (5) : a cleaner environment and a more efficient economy. Growth 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. It 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 per cent 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 agriculture 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) exacerbate soil erosion; and the spread of monoculture and use of high-yielding varieties of crops have been accompanied by the (15) of old varieties of food plants which (16) some insurance 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 per cent of its cropped land to meadow or forest. Topsoil in India andChina is (20) much faster than inAmericA、
A．thinking
B．considering
C．longing
D．counting
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第4题：When theAmerican economy was running full tilt two years ago, few places were as breathlessly delighted as Seattle. Its port was thronged with ships bringing goods fromAsi
A、TheBoeingCompany could barely keep up with demand for its airliners. Microsoft was hiring hordes of software engineers.After each rain shower, another Internet millionaire sprang up. Here was a city that had it all--OldEconomy, NewEconomy, Not-Yet-InventedEconomy.
Now it has all gone sour. The past 12 months have been a non-stop succession of disappointments.Boeing’s headquarters decamped toChicago. The Internet economy popped alike a balloon in a nail factory, taking with it once promising local ventures such as Homegrocer.com and leaving can’t-possibly-miss companies such as drugstore.com barely hanging on.And an already troubledBoeing was hit even harder after September 11th both by a steep drop in airliner orders and by losing a $ 200 billion Joint Strike Fighter contract to Lockheed Martin.
Washington State, battered by what is happening in Seattle, now has the highest unemployment rate in the United States--6.6% compared with 5.4% in the country as a whole. Right behind it is next-door Oregon, another former boom state, with 6.5% of its workforce out of a job, the country’s second worst figure. In Oregon, manufacturing’s collapse has caused the loss of nearly 30,000 jobs in a year, those hit range from Freightliner, a maker of heavy lorries, to high-tech companies such as Intel and Fujitsu.
What makes the current plunge so painful is that every part of the economy seems to have stepped into an open manhole at the same time. Three years ago, whenBoeing began to remove more than 20,000 people thatBoeing expects to lay off by the middle of 2002 have to compete with unemployed workers not just from the high-tech industry but from construction work and even the retail sector. Portland now has more jobless than the other parts of Oregon: the opposite of how things were years ago.
Even worse, the Pacific north west’s downturn, as well as being deeper than the rest of the country, may also last longer. One reason for fearing this isBoeing’s continuing woes. NowadaysBoeing accounts for less than 5% of employment in the Seattle area, down from 9% two decades ago.But it remains the foundation on which the rest is built. Its network of suppliers and subcontractors gives it a far stronger multiplier effect than, say, Microsoft, which is more an island of prosperity than a center of weB、The chances are thatBoeing will not really bounce back until the assumed revival in air travel persuades airline companies to start buying plenty of aircraft again.And that may not be until 2003.
What is special about this economic downturn in Seattle

A、All sectors have entered recession at the same time.
B、The lay-off workers have found jobs elsewhere.

C、The OldEconomy is hit harder than other economies.
D、The low employment rate will last longer than in Oregon.
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第5题：从1，2，3，4，…，20这20个自然数中任取3个不同的数，使它们成等差数列，这样的等差数列共有( )个．
A、90
B、120
C、180
D、190
E、200
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Each year, hundreds of thousands of people die from heart attack, a leading cause of death. In the Landmark Physicians’ Health Study at Harvard University in the United States in the late 1980s, a research team led byDr. Hennekens studied 22, 701 healthy male physicians, half of whom were randomly{{U}} (1) {{/U}}to take an aspirin every other day while the others took placebos(安慰剂).After the participants had been{{U}} (2) {{/U}}for an average of five years, the doctors in the aspirin group were found to have suffered 44 percent fewer first heart attacks. {{U}} (3) {{/U}}, a recent international study indicates that aspirin can be beneficial for those people with a history of coronary artery(冠动脉) bypass surgery, {{U}} (4) {{/U}}of their sex, age or whether they have high blood pressure or diabetes.
According to a report by theAmerican HeartAssociation, doctors should consider prescribing{{U}} (5) {{/U}}aspirin for middle-aged people with a family history of, or{{U}} (6) {{/U}}for, heart disease. (Risk factors include smoking, being more than 20 percent overweight, high blood pressure and lack of exercise. )
Aspirin is also a lifesaver during heart attacks. Paramedics now give it routinely, and experts urge anyone with chest pain, {{U}} (7) {{/U}}if it spreads to the neck, shoulder or an arm, or is accompanied by sweating, nausea (恶心), lightheadedness and breathing difficulty to chew and {{U}} (8) {{/U}}an aspirin tablet immediately.
When taking aspirin for heart attack, {{U}} (9) {{/U}}the plain, uncoated variety. For even faster absorption, crush and mix with a little water. Speed of absorption is critical because most heart attack deaths occur{{U}} (10) {{/U}}the first few hours after chest pain strikes.
第6题：
Directions: Read the following text.Choose the best word(s) for each numbered blank.
A．for
B．along
C．within
D．except
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第7题：
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第8题：司机：有经验的司机完全有能力并习惯以每小时120公里的速度在高速公路上安全行驶。因此，高速公路上的最高时速不应由120公里改为现在的110公里，因为这既会不必要的降低高速公路的使用效率，也会使一些有经验的司机违反交规。
交警：每个司机都可以在法律规定的速度内行驶，只要他愿意。因此，把对最高时速的修改说成是某些违规行为的原因是不能成立的。
以下哪项最为准确的概括了上述司机和交警争论的焦点
A．上述对高速公路最高时速的修改是否必要。
B．有经验的司机是否有能力以每小时120公里的速度在高速公路上安全行驶。
C．上述对高速公路最高时速的修改是否一定会使一些有经验的司机违反交规。
D．上述对高速公路最高时速的修改实施后，有经验的司机是否会在合法的时速内行驶。
E．上述对高速公路最高时速的修改，是否会降低高速公路的使用效率。
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第9题：等差数列an的前n项和为Sn，且
，则
=______。
A．
B．
C．
D．
E．以上都不正确。
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第10题：The invention of both labor-saving tools and tools of intelligence is rarely accidental. Instead, it is usually the product of human need; (21) is truly the mother of invention. People usually devise tools to (22) for natural deficiencies. For example, people invented weapons to defend (23) from physically superior (24) .But (25) is only one incentive for inventions. People also invent (26) tools to (27) certain established tasks more efficiently. For instance, people developed the bow and arrow from the (28) spear or javelin in order to shoot (29) and strike with greater strength.
(30) civilizations developed, greater work efficiency came to be demanded, and (31) tools became more (32) .A、tool would (33) a function until it proved (34) in meeting human needs, at which point an improvement would be made. One impetus for invention has always been the (35) for speed and high-quality results--provided they are achieved (36) reasonable costs. Stone pebbles were sufficient to account for small quantities of possessions, (37) they were not efficient enough for performing sophisticated mathematics. However, beads arranged systematically evolved into the abacus. The (38) of this tool can be (39) to the development of commerce in theEast around 3000B、C、, and the abacus is known (40) by the ancientBabylonians,Egyptians,Chinese, etC、
A、farB、furtherC、fartherD、furthest
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