单选题 {{B}}Passage Three{{/B}}

It is possible that the weather of the world may be changing. Some scientists imagine that this could even mean the beginning of another ice age. The effects of such a change in weather on human population of the world would be frightening.
Recent research suggests that the warming trend (倾向) of the past hundred years or so may be coming to an end. During the past ten years, scientists tell us that the temperature of the world has dropped a little. This would have effects on wind and rain in the weather picture.
Scientists believe clouds may be an important factor (因素) in changing the amount of heat on the earth. Another possibility is that man's agriculture and industry ways may affect the natural weather.

单选题 The weather of the world seems to be getting ______.

【正确答案】 B

【答案解析】参见句子：During the past ten years，scientists tell us that the temperature of the world has dropped a little．

单选题 The temperature of the world in the past ten years has dropped a little ______.

A、 because wind and rain changed the weather
B、 the drop in the temperature would have effects on wind and rain
C、 because wind and rain did not change the weather
D、 the drop in the temperature would not have effects on wind and rain

单选题 The main factor in changing the amount of heat on the earth is ______.

【正确答案】 D

【答案解析】参见句子：Scientists believe clouds may be an important factor(因素)in changing the amount of heat on the earth．

单选题 The warming weather of the past hundred years may ______.

【正确答案】 B

【答案解析】参见句子：Recent research suggests that the warming trend(倾向)of the past hundred years or so may be coming to an end．其中，come to an end＝end。