．The conference aims to develop business and let people think about ______ they can have a positive influence on the planet．

       A．why      B．that            C．what      D．how

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科目：高中英語(yǔ) 來源： 題型：

最近，很多中學(xué)生都紛紛開起了自己的博客。一方面，博客可以作為展示自己的窗口，

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科目：高中英語(yǔ) 來源： 題型：閱讀理解

Domestic (馴養(yǎng)的) horses now pull ploughs, race in the Kentucky Derby, and carry police. But early horses weren’t tame (馴服的) enough to perform these kinds of tasks. Scientists think the first interactions humans had with horses were far different from those today.

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Modern day horse breeds come in a wide variety of shapes and sizes. This variety didn’t exist in the horse population before domestication. The Shetland horse is one of the smallest breeds—typically reaching only one meter tall. With short, strong legs, the animals were bred to pull coal out of mine shafts (礦井) with low ceilings. Huge horses like the Clydesdale came on the scene around 1700. People bred these heavy, tall horses to pull large vehicles used for carrying heavy loads.

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B. hunted for food

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4. The passage is mainly about _______.

A. why humans domesticated horses

B. how humans and horses needed each other

C. why horses came in different shapes and sizes

D. how human societies and horses influenced each other

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