Unfortunately man has killed wild animals, polluted rivers and cut down forests through the ages. But lately people are beginning to realize that their own lives depend on the way they treat “Nature and living things” in it.
Man has 16 ways of showing his love to nature. He says he loves it, although he often 17 its beauty. While walking through the woods, how many times have we picked flowers, planted roots and all? Then later, as the 18 wither(枯萎), we throw them away. That’s one of the reasons 19 many kinds of plants and flowers have become rare(稀少). Or have you 20 wondered where all the thousands of New Year trees come from and 21 happens to them once the 22 are over?
Man destroys nature by polluting the air. That’s probably the greatest danger 23 our lives. The smoke from factories and 24 from cars and trucks do not harm only the surrounding vegetation(植被), it 25 our health, too.
Man pollutes rivers, seas and oceans. Just think of the 26 fish that die by the thousands because of polluted waters.
Biologists have 27 that all kinds of wild life are 28 in the areas where they live. Even the wolf, which we 29 dangerous and “bad”, plays an important role in na ture. Here is an interesting example. There is a large 30 in one of the Great Lakes between Canada and the US. Early in this century many wild deer invaded(涌入) the island. Nobody knows how they 31 there.
The deer multiplied(繁殖) until there were as many as 40000 on the island. They destroyed 32 of the vegetation on it. Finally as they couldn’t find enough 33 they began to starve and die. Then came the wolf: 34 knows how wolves got to the island, but they 35 . The wolves killed those deer that were easiest to catch—the sick, the weak and the old. So only the strong and the healthy animals were left. The island become green once again and there was enough food for the deer that were left.
16. A. lovely B. strange C. many D. much
17. A. harms B. breaks C. injury D. destroys
18. A. stems B. branches C. leaves D. flowers
19. A. what B. how C. why D. when
20. A. still B. ever C. even D. quite
21. A. which B. that C. what D. how
22. A. years B. meetings C. parties D. holidays
23. A. to B. of C. about D. for
24. A. waters B. smells C. gases D. whistles
25. A. effects on B. efforts for C. reasons for D. causes of
26. A. poor B. weak C. strong D. ill
27. A. studied B. developed C. invented D. discovered
28. A. valuable B. need C. necessary D. helped
29. A. consider B. think it C. regard D. sound
30. A. field B. land C. mountain D. island
31. A. left B. got C. reached to D. arrived in
32. A. a whole B. most C. more D. more much