Question

Trees are useful to man in three very important ways. They provide him with wood and other 1 ; they give him shade; they help to prevent drought(干旱)and 2.
Unfortunately, in many parts of the world, 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. It gained the empire, but,3its trees, its soil became hard and poor. When the empire fell to4,the home country found itself faced by floods and starvation.
Even where a government realizes the importance of a plentiful supply of trees, it is difficult for5to persuade the villager to see this. The villager wants wood to cook his food with ; and he can earn money by making charcoal or selling wood to the townsman. He is usually too lazy or too careless to plant and look after new trees. So, unless the government has a good system of control, or can6the people, the forests will slowly disappear.
This does not only mean that the villagers’ sons and grandsons have7trees. 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(结合)the soil, thus preventing its8washed away easily, but where there are no trees ,the rain falls on hard ground and carrying9with it the rich top soil, in which crops10so well. With all the topsoil gone, nothing remains but worthless desert.

1. 1.
   1. A.
      uses
   2. B.
      products
   3. C.
      production
   4. D.
      result
2. 2.
   1. A.
      floods
   2. B.
      soil
   3. C.
      air
   4. D.
      sunlight
3. 3.
   1. A.
      with
   2. B.
      by
   3. C.
      on
   4. D.
      without
4. 4.
   1. A.
      break
   2. B.
      unite
   3. C.
      bits
   4. D.
      pieces
5. 5.
   1. A.
      it
   2. B.
      them
   3. C.
      he
   4. D.
      they
6. 6.
   1. A.
      ask
   2. B.
      educate
   3. C.
      want
   4. D.
      remove
7. 7.
   1. A.
      a few
   2. B.
      fewer
   3. C.
      a little
   4. D.
      little
8. 8.
   1. A.
      been
   2. B.
      being
   3. C.
      is
   4. D.
      was
9. 9.
   1. A.
      away
   2. B.
      off
   3. C.
      with
   4. D.
      by
10. 10.
    1. A.
       come
    2. B.
       grow
    3. C.
       get
    4. D.
       Turn

Answer 1

BADDA BBBAB
1.树木给人类提供木材和其他的产品（products），而production具有抽象的含义，指生产过程。  
2.与干旱相对，即涝灾（flood），也可以后文得到证实。
3.without its trees没有了树。   
4.fall to pieces是习语，意为“四分五裂”。   
5.it代指前句所指的government。   
6.educate教育（人民）。   
7.有比较含义，较少，用fewer。   
8.有在prevent后，动名词being可表被动，其逻辑主语为its.    
9.carry away带走，习惯用语。  
10. grow此处为不及物动词，“生长”。