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  3. In everyday usage "hot" means "having a lot of heat". Many people think that "cold" is something completely separated from heat.

In everyday usage "hot" means "having a lot of heat". Many people think that "cold" is something completely separated from heat.

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问题     In everyday usage "hot" means "having a lot of heat". Many people think that "cold" is something completely separated from heat. But this is not true. Cold simple means " having very little heat". Your life depends on heat. In fact, every living thing depends on it. Without heat, every living thing would be frozen to death. All living things get their heat from the sun, which provides the conditions in which life is possible.
    Since before the dawn of history, man has been able to make his own heat. He has been able to release the sun’ s heat that is trapped in things such as wood, coal and oil. And he has been able to use this heat.
    Heat has made civilization possible. With heat, man could melt metals. As man learned to use metals and fuels, industries grew. As a result, engines were invented. These are machines that change heat energy into mechanical energy. Engines can do the work of many men. Without engines industrial civilization is impossible.
    Yet when the first engines were built in the 17th century, men were, still wondering about the nature of heat. "What is it?" they asked. Not until the early years of the 19th century did they find the right answer.  
From the underlined sentence in paragraph 2, we know that______.
选项 A、man can get heat from things like wood, coal and oil
B、man can not get the heat directly from the sun
C、only wood, coal and oil have heat
D、all the sun’ s heat is trapped in things
答案A
解析 推理判断题。本句意为“人类可以释放出存储在木头、煤炭和石油等物 体中的太阳热量。”由此可推知，人类可以从木头、煤炭和石油中获得热量，故选A。 结合上下文可知，本句重点表达了人类可以自己制造热量，而不是单纯依靠太阳，并 没有说明人类无法直接获取太阳的热量，故B项错误；C、D项都以偏概全，故不选。
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