题目内容
（请给出正确答案）
He ought to have handed in the paper yesterday. That's what he ______.
A．should do
B．should be doing
C．should have done
D．should
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B.should have done
C.should be doing
D.should
A．Be not sure to touch it
B．Be sure not to touch it
C．Be sure to not touch it
D．Don't be sure to touch it
Your life depends on heat. In fact, every living thing depends on it. (28) 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 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. Engine 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 19th century did they find the right answer.
In everyday usage, "hot" means______.
A．the weather is fine and it is in summer
B．one has a temperature
C．having a great deal of heat
D．having very little heat
Whatever its underlying reasons are, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the home there is an obvious need to control litter and waste. Food comes wrapped up three or four times in packages that all have to be disposed of; drinks are increasingly sold in bottles or tins which cannot be reused. This not only causes a litter problem, but also is a great waste of resources, in terms of glass, metal and paper. Advertising has helped this process by persuading many of us not only to buy thing we neither want nor need, but also to throw away much of what we do buy. Pollution and waste combine to be a problem everyone can help to solve by cutting out unnecessary buying, excess use and careless disposal (处理) of the products we use in our daily lives.
The main cause of pollution is______.
A．the release of artificial or natural substances into the environment
B．the production of new industrial goods
C．increased amounts of a natural substance
D．our ever-increasing population
B. satisfied with their life
C. gaining access to other countries
D. taking more foreign holidays
A．Cutting out unnecessary buying.
B．Eating less.
C．Reduce excess use.
D．Carefully dispose our daily products.
A．to blame
B．for
C．for
D．discovered
A．In the 1700s.
B．In the 1800s.
C．In the 1880s.
D．Never.
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