大学英语A7试卷
一、阅读理解
1、After a long period of studies, scientists are uncovering surprising new findings about dolphins. They believe that dolphins do "talk" to each other, whistling "names" among themlves and others in their group. They help one another when in trouble. Like bats, they u sound waves to "e". Becau of the and many other findings, many scientists now place dolphins among the cleverest animals on earth.
Dolphins love to mimic. If we swim on our backs, they do too. If we dive, they follow. Once a trainer blew a puff of cigarette smoke against the window of an obrvation tank, a young dolphin suddenly swam to its mother, nurd a moment, and spit out a cloud of milk. It is even more surprising that dolphins are able to understand sign language. One of Herman's dolphins has mastered more than 50 sign words. For example, it understands the difference between "bring the surfboard to the person" and "bring the person to the surfboard."
Scientists are learning how dolphins "speak" to each other. "Each dolphin," says Peter Gyack "has its own 'signature' whistle." Dolphin can also mimic the signature of others.
Dolphins help one another. When birth-giving takes place, females gather to keep off sharks. Later, while the mother looks for food, they take care of the young dolphin, swimming in a circle.
Dolphins reach out to us in astonishing ways. What would the world be like without them?
(1)、To the best of our knowledge, dolphins are ______.
A：surprising fish
B：interesting animals
C：intelligent mammals
D：man's friends
答案： C
(2)、In the cond paragraph, "nurd" means ______.
A：brought the mother something to eat
B：sucked milk from the mother dolphin
C：asked to be taken care of
D：gave some milk to her
答案： B
(3)、What was the young dolphin doing when it suddenly spit out a cloud of milk? It was ______.
A：having a little fun
B：diving into the deep a
C：playing "smoking"
D：copying "smoking"
答案： D
(4)、Which of the following do you think is more reasonable?
A：We are still in the early stage of learning about the animals.
B：We have little difficulty in understanding dolphins.
C：Man will be able to talk freely to dolphins in the near future.
D：Sign language is the only way to make dolphins understand us.
答案： A
(5)、What's the purpo of female dolphins' swimming in a circle?
A：The young dolphin needs friends to play with.
B：The young dolphin can play safely inside.
C：The mother will help them to learn swimming in a circle.
D：The mother will be free to meet the father.
答案： B
2、Remember global warming? Back in December, the threat of climate change was thundering and the rich countries agreed to cut their carbon-dioxide and other green-hou-related emissions. Since then, interest has cooled markedly, and many European countries are already running away from the promis they made so loudly a few months ago. But there has been much talk, and a bit of action, to encourage renewable energies such as wind, hydro, solar and all living organisms. The emit no greenhou gas, but tend to cost more than coal, oil or gas.
The better, simpler idea is to remember that the easiest way to reduce something is to tax it - in this ca, by taxing the carbon content power. The dirtier the power, the more tax it would pay. So dirty coal would be more expensive than clean coal, which would e
its price ri in relation to oil, which would be more expensive compared with gas, which would lo some of its price advantage over renewables.
Unless a carbon tax was so huge as to be economically crippling, it would not remove the price differential between all renewables and fossil fuels. But it would narrow that gap, by fixing the differing environmental costs into the price - a uful principle in itlf. It would also give renewable producers a strong incentive to cut costs, and fossil-fuel suppliers the motivation to clean their products.
Precedents suggest strongly that a carbon tax would be effective. But the disadvantage to carbon tax is political. After almost a decade of trying, the European Union gave up an attempt at a European carbon tax last year. Germany's ruling coalition is fighting against a propod energy tax. In America, politicians believe that even mentioning the notion is certain death. But many of the political objections could be met if a carbon tax were made up for the loss elwhere, for example by lowering payroll or sales taxes. There is always suspicion when governments come up with clever new ways
to tax, and rightly so. The respon to that suspicion should be to win the argument, not to abandon it.
(1)、According to the passage, the easiest way to remove global warming is ___________.
A：to encourage people to u renewable energies
