Passage 2
Questions 6 to 10 are based on the following passage:
Trees are useful to man in three very important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts (干旱) and floods.

Unfortunately, man has not realized that the third of these services is the most important. Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire(帝国). It gained the empire, but, without its trees, its soil became hard and poor. When the empire fell to pieces, the home country found itself faced by flood and starvation.

(77)(Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade villagers to see this. )The villagers want wood to cook their food with; and they can earn money by selling wood. They are usually too lazy to plant and look after the trees. (78)(So, unless the govemment has a good system of control, or can educate the people, the forests will slowly disappear.)

This does not only mean that the villagers' children and grandchildren will have fewer trees. The results are even more serious, for where there are trees their roots break the soil up  allowing the rain to sink in - and also bind the soil, thus preventing its being washed away easily but where there are no trees, the rain falls on hard ground and flows away from the surface, causing flood.
6. What is the most important function of trees?
A. Providing fuel.               B. Offering shade.
C. Preventing natural disaster.     D. Providing wood.
7. What eventually happened to the empire in the paragraph?
A. Its people died of hunger.
B. It fell to pieces.
C. It became a giant empire.
D. It built many ships with wood.
8. It is implied in the passage that the villagers__________
A. want a plentiful supply of trees.
B. want firewood badly.
C. just want to get money.
D. don't realize the importance of trees.
9. The role of trees is to__________
A. loosen soil                 B. keep soil in position
C. harden soil                D. both A and B
10. What is the passage mainly concerned with?
A. The benefits of trees.
B. Trees and soil protection
C. The various uses of trees.
D. Different attitudes toward trees.

Passage 3
Questions 11 to 15 are based on the following passage:
Adam Smith was the first person to see the importance of the division of the labor. He gave us an example of the process by which pins were made in England.
"One man draws out the wire, another strengthens it, a third cuts it, a fourth points it, and a fifth gives it a head. Just to make the head requires two or three different operations. The work of making pins is divided into about eighteen different operations, which in some factories are all performed by different people, though in others the same man will sometimes perform two or three of them.