B. It results in shortage of goods.

　　C. It demands more fossil fuels.

　　D. It causes a poverty problem.

　　3. The candle and lamp example is used to show that　.　

　　A. oil lamps give off more light than candles

　　B. shortening working time brings about a happier life

　　C. advanced technology helps to produce better candles

　　D. increased production rate leads to lower cost of goods

　　4. What does the last sentence of the passage imply?

　　A. Cutting carbon is necessary in spite of the huge cost.

　　B. Overreaction to climate change may be dangerous.

　　C. People’s health is closely related to climate change.

　　D. Careless medical treatment may cause great pain.

　　【参考答案】1-4 DADB

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　Howling is a behaviour commonly observed among a wolf pack. As pack animals, wolves work together to hunt and rely on howling as an important means of communication among each other. There are different explanations of a wolf’s howl and it appears that there may be more to discover.

　　One theory is that wolves howl to bond better together. It’s almost as if howling together helps the pack stay together. Perhaps something similar to people feeling a sense of involvement with each other when singing a song together. But this theory may be wrong, explains Fred H. Harrington, a professor who studies wolf behaviour.

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