(1)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 simply means “having very little heat.” (2)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. (3)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. (4)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. (5)Yet when the first engines were built in the 1
In everyday usage, “hot” means _______
- A、the weather is fine and it is summer
- B、one has a temperature
- C、having a great deal of heat
- D、very little heat
正确答案:C
答案解析:有
Your life depends on heat. The sentence means _______
- A、in the cold season human beings will die
- B、one usually builds his life on fire
- C、the more heat one has, the better
- D、it is impossible for man to live without heat
正确答案:D
答案解析:有
He has been able to release the sun’s heat that is trapped in things such as wood, coal and oil. From this sentence we know______
- 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
正确答案:A
答案解析:有
Which of the following is true?
- A、Without engines civilization is impossible
- B、Without engines we have no industrial civilization
- C、Engine came before civilization
- D、Engines came before man knew how to use heat.
正确答案:B
答案解析:有
From the last two sentences, we can see_______
- A、men have never found the nature of heat.
- B、men found the nature of heat in the 17th century
- C、men found the nature of heat in the 19th century
- D、men found the nature of heat before the 19th century.
正确答案:C
答案解析:有
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