4. What can be inferred from the last paragraph?

　　A. The mother is successful in her career.

　　B. The family members like travelling.

　　C. The author had little time to play when young.

　　D. The marks on the breadboard have disappeared.

　　5. In the author's mind, her mother is ________.

　　A. strange in behaviour

　　B. keen on her research

　　C. fond of collecting old things

　　D. careless about her appearance

　　B

　　In the atmosphere，carbon dioxide allows the sun's rays to enter but prevents the heat from escaping. According to a weather expert's prediction，the atmosphere will be 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 meters and severely flooding coastal cities.Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere.

　　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 suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.

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