Text 4In the atmosphere, carbon dioxide acts rather like a one-way mirror—the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping.According to a weather expert’s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metes and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of the earth’s chief food-growing zones.In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming: in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be failing. Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has most effect on the weatherOne possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot spots and "cold" spots (that is, the relatively less hot spots) on the sun. As the sun rotates, every 27.5 days, it presents hotter or "colder" faces to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth’s atmospheric pressure, and consequently on wind circulation. The sun is also variable over a long term: its heat output goes up and down in cycles, the latest trend being downward.Scientists are now finding mutual relations between models of solar-weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia of the earth’s climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful counter-balance to the sun’s diminishing heat. On the basis of their models, scientists are of the opinion that ().
A. the climate of the world should be becoming cooler
B. it will take thousands of years for the inertia of the earth’s climate to take effect
C. the man-made warming effect helps to increase the solar effects
D. the new Ice Age will be delayed by the greenhouse effect
Questions 16-20Complete the following notes using NO MORE THAN THREE WORDS for each answerIf robbed, you should contact your (16) or Darlinghurst Police Station with the following details:· your full name· your contact telephone number· time of the incident· location of the incident, for example, nearest (17) or name of (18) · (19) of item that was stolen.Prevent illegal use of credit cards by (20) as soon as possible after the theft. 17()
A person’s home is as much a reflection of his personality as the clothes he wears, the food he eats and the friends he spends his time with. Depending on personality, most people have in mind a (n)" (1) home". But in general, and especially for the students or new wage earners, there are practical (2) of cash and location on achieving that idea.Cash (3) , in fact, often means that the only way of (4) when you leave school is to stay at home for a while until things are (5) financially. There are obvious (6) of living at home-personal laundry is usually (7) done along with the family wash; meals are provided and there will be a well-established circle of friends to (8) . And there is (9) the responsibility for paying bills, rates, etc.On the other hand, this (10) depends on how a family gets on. Do your parents like your friends You may love your family— (11) do you like them Are you prepared to be (12) when your parents ask where you are going in the evening and what time you are expected to be back If you find that you cannot manage a (n) (13) , and that you finally have the money to leave, how do you (14) finding somewhere else to liveIf you plan to stay in your home area, the possibilities are (15) well-known to you already. Friends and the local paper are always (16) . If you are going to work in a (17) area, again there are the papers—and the accommodation agencies, (18) these should be approached with (19) . Agencies are allowed to charge a fee, usually the (20) of the first week’s rent, if you take accommodation they have found for you. 11()
A. and
B. but
C. still
D. or
分项工程进行实测项目检查时应按规定频率有规律抽样。( )
A. 对
B. 错