- [材料题] （1）In everyday usage “hot” means “having a lot of heat”. Many people think that “cold” in 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 17th c
- 单项选择题1.From the last two sentences, we can infer that _________
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、A. men found the nature of heat before the 19th century
- C
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- 单项选择题2.Which of the following is NOTtrue?
A、People can not live without heat
B、The first engine is built in the 17th century
C、Cold means no heat at all
D、Engines came before man knew the nature of heat
- C
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- 单项选择题3.When did people know how to get their own heat?
A、In the Middle Age
B、Before the dawn of history
C、In the 17th century
D、A. In the 19th century
- C
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- 单项选择题4.The sentence “Your life depends on heat.” means____
A、in the cold season human being will die
B、one usually builds his life on fire
C、the more heat one has, the better he is
D、A. it is impossible for man to live without heat
- D
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- 单项选择题5.In everyday use, “hot” means______
A、the weather if fine and it is summer
B、one has a fever
C、having a lot of heat
D、spicy
- C
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