Many pure metals have little use because they are too soft, rust too easily, or have some

In the two cooling curves (A and B) shown in Figure 1, A is for pure metals and B for general glass.

There are various kinds of metals, each () its own properties .

A、has

B、had

C、to have

D、having

There are many kinds of metals ______.

A、each has its special properties

B、one has its special properties

C、each having its special properties

D、having its special properties

A.each having its special properties

B.having its special property

C.one has its special properties

D.each has its special properties

up, in, on, lotus, draped, rest, muck, untouched, picked, fantasies, pristine

Then ,having started the wash, and reflecting ___1__ the symbol of the ___2___ in Oriental philosophy which rises, pure and ____3__ from the mud and __4___ ,I walked proud and __5___ among the gym trunks and sweatshirts, and out into the___6__ of the house to tidy it ____7__.There I indulged in aggressive ____8__ against my dear family as I __9__ up a necktie __10__ on the lamp.

A.Henry James

B.Mark Twain

C.Nathaniel Hawthorne

D.Henry David Thoreau

apidly. They are no longer restricted by their environment, as they can live in the most hostile of deserts or the bitter cold of Antarctic.Human culture is heavily based on the earth's natural resources -- oil, coal and metals; soil, water and forests. Industrialized society is using increasing amounts of these resources each year. Governments and industrialists strive for economic growth -- for factories and mines to produce more each year than they did in the previous year. But fuels and metals and, to a lesser extent, the soil are nonrenewable resources. Once used they are gone forever. In many cases the lifetime of these resources is coming to an end.Factories and machines create wastes. These wastes are poured into the atmosphere, the water and even into the soil. The damaging effect of this pollution is, in some cases, permanent. To reduce pollution creates further problems. Factories may have to be redesigned or even pulled down. This costs money and may mean loss of livelihood (生计) for many workers.Modern technology is creating an additional problem -- it is making industry more and more automatic (自动化 . This means that fewer and fewer people are needed to operate factories and offices. The consequent loss of jobs is a worldwide problem and western society is still struggling to find the answer.This introduction gives you some idea of the topics to be discussed in detail in this chapter.

1.This passage is most probably written as ____.

A、the beginning part of a certain chapter

B、the middle part of a certain chapter

C、the last part of a certain chapter

D、a self-contained chapter

2.Which of the following topics is NOT discussed in the passage？ ____

A、Natural Resources

B、Industrial Pollution

C、Unemployment

D、Overpopulation

3.The author's purpose in the first paragraph is to tell us the fact that ____.

A、deserts are hostile

B、Antarctic is very cold

C、human beings now inhabit the entire Earth

D、there are many different species on planet Earth

4.According to the passage, some natural resources like fuels and metals ____.

A、are no longer new

B、will never be gone

C、will soon be used up

D、can not be used at present

5.The phrase `strive for' in the second paragraph means ____.

A、fight with each other in order to get'

B、make great efforts to achieve'

C、have a violent struggle because of'

D、suffer a lot from'

6.Which pollution is NOT mentioned in the passage？ ____

A、Air Pollution

B、Water Pollution

C、Soil Pollution

D、Sound Pollution