题目内容

17.Sorry about the mess.The house       at the moment.(  )
A.has paintedB.had painted
C.is being paintedD.will be painted

分析 很抱歉,这里很乱.房子正在装修呢.

解答 答案:C.
The house和paint为逻辑上的动宾关系,所以应该使用被动语态,故排除A和B;根据前面的道歉及时间状语at the moment可知应该是房子因为正在装修才很乱,而不是将来要装修,排除D;故选C.

点评 对于时态的选择题要注意时间状语;如果句中没有时间状语,则要根据句子的意思来判断具体时态的运用.

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Global warming is having a great effect on hundreds of plant and animal species around the world,changing some living patterns,scientists say.
Increased carbon dioxide(CO2)in the air from burning coal and oil can have an effect on how plants produce oxygen,while higher temperatures and changeable rainfall patterns can change their patterns of growth.
"Predicting species'reaction to climate change is a major challenge in ecology,"said the researches of several U.S.universities.They said plants had been the key object of study because their reaction to climate change could have an effect on food chains and ecosystem services.
The study,published on the Nature website,uses the findings from plant life cycle studies and experiments across four continents and 1,634species.It found that some experiments had underestimated(低估)the speed of flowering by 8.5times and leafing by 4times.
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The design of future experiments may need to be improved to better predict how plants will react to climate change,it said.
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Scientists believe the world's average temperature has risen by about 0.8℃since 1900,and nearly 0.2℃every ten years since 1979.
So far,efforts to cut emissions(排放)of planet-warming greenhouse gases are not seen as enough to prevent the Earth heating up beyond 2℃this century-a point scientists say will bring the danger of a changeable climate in which weather extremes are common,leading to drought,floods,crop failures and rising sea levels.

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C.scientists should improve the design of the experiments
D.the experiments failed to predict how plants react to climate change
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D.they are growing and flowering much faster than before
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D.It needs to be controlled within 2℃in this century.

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