When discussing the causes of
When discussing the causes of animal endangerment
When discussing the causes of animal endangerment, it is important to understand that individual species are not the only factors involved in this difficult situation. Endangerment is a broad 50 , one that involves the habitats(栖息地) and environments where species live and interact with one another. Although some measures are being taken to help specific cases of endangerment, the universal problem cannot be solved until humans 51 the natural environments where endangered species live. There are many reasons why a particular species may become endangered, but habitat destruction is on top.
Our planet is continually changing, causing habitats to be altered and modified. Natural changes tend to occur at a 52 pace, usually causing only a slight 53 on individual species. However, when changes occur at a fast pace, there is little or no time for individual species to 54 and adjust to new circumstances. This can create disastrous results, and for this reason, rapid habitat loss is the primary cause of species endangerment. The strongest 55 in rapid habitat loss are human beings. Nearly every region of the earth has been affected by human activity, particularly during this past century. The loss of microbes (微生物) in soils that 56 supported tropical forests, the 57 of fish and various aquatic species in polluted habitats, and changes in global climate brought about by the 58 of greenhouse gases are all results of human activity.
It can be difficult for an individual to 59 the effects that humans have had on specific species. It is hard to identify or predict human effects on individual species and habitats, especially during a human lifetime. But it is quite 60 that human activity has greatly 61 to species endangerment. 62 , although tropical forests may look as though they are thick and healthy, they are 63 highly susceptible (易受影响的）to destruction. This is because the soils in which they grow 64 nutrients. It may take centuries to re-grow a forest that was cut down by humans or destroyed by fire, and many of the world’s severely threatened animals and plants live in these forests. If the current rate of forest loss continues, huge quantities of plant and animal species will disappear.
50. A. theme B. project C. issue D. experiment51. A. worsen B. protect C. construct D. ignore52. A. gradual B. single C. stable D. rapid53. A. anxiety B. improvement C. impact D. burden54. A. survive B. react C. reflect D. live55. A. ruins B. objections C. limitations D. forces56. A. formerly B. formally C. freely D. usually57. A. appreciation B. destruction C. extinction D. existence58. A. escape B. leak C. release D. relief59. A. cause B. remind C. remember D. recognize60. A. reasonable B. apparent C. possible D. natural61. A. devoted B. donated C. contributed D. adapted62. A. In short B. By contrast C. As a result D. For example63. A. naturally B. actually C. fully D. completely64. A. lack B. contain C. reduce D. limit
正确答案：
“Natural changes tend to occur at a 52 pace, usually causing only a slight 53 on individual species.However, when changes occur at a fast pace。。。 ”这里的however表明前后的句意应该是相反的，后面说“However, when changes occur at a fast pace, ”，那前面所提到的变化就不是急剧的，而是平缓逐步的，所以要填gradual，根据常识也可知道，自然界在不受人类活动的影响下变化是缓慢渐进的，而这种缓慢的变化对物种所造成的影响是很轻微的，所以填impact（影响），anxiety（焦虑）代入句子后句意不同。
“62 , although tropical forests may look as though they are thick and healthy, they are 63 highly susceptible (易受影响的）to destruction. This is because the soils in which they grow 64 nutrients...animal species will disappear. ”整个这一部分是在说一个例子，来证明人类活动对物种濒危所造成的影响， “In short”意为简而言之，一般用来引出总结句，用在这里显然不对。找教案网
Our planet is continually changing, causing habitats to be altered and modified. Natural changes tend to occur at a 52 pace, usually causing only a slight 53 on individual species. However, when changes occur at a fast pace, there is little or no time for individual species to 54 and adjust to new circumstances. This can create disastrous results, and for this reason, rapid habitat loss is the primary cause of species endangerment. The strongest 55 in rapid habitat loss are human beings. Nearly every region of the earth has been affected by human activity, particularly during this past century. The loss of microbes (微生物) in soils that 56 supported tropical forests, the 57 of fish and various aquatic species in polluted habitats, and changes in global climate brought about by the 58 of greenhouse gases are all results of human activity.
It can be difficult for an individual to 59 the effects that humans have had on specific species. It is hard to identify or predict human effects on individual species and habitats, especially during a human lifetime. But it is quite 60 that human activity has greatly 61 to species endangerment. 62 , although tropical forests may look as though they are thick and healthy, they are 63 highly susceptible (易受影响的）to destruction. This is because the soils in which they grow 64 nutrients. It may take centuries to re-grow a forest that was cut down by humans or destroyed by fire, and many of the world’s severely threatened animals and plants live in these forests. If the current rate of forest loss continues, huge quantities of plant and animal species will disappear.
50. A. theme B. project C. issue D. experiment51. A. worsen B. protect C. construct D. ignore52. A. gradual B. single C. stable D. rapid53. A. anxiety B. improvement C. impact D. burden54. A. survive B. react C. reflect D. live55. A. ruins B. objections C. limitations D. forces56. A. formerly B. formally C. freely D. usually57. A. appreciation B. destruction C. extinction D. existence58. A. escape B. leak C. release D. relief59. A. cause B. remind C. remember D. recognize60. A. reasonable B. apparent C. possible D. natural61. A. devoted B. donated C. contributed D. adapted62. A. In short B. By contrast C. As a result D. For example63. A. naturally B. actually C. fully D. completely64. A. lack B. contain C. reduce D. limit
正确答案：
“Natural changes tend to occur at a 52 pace, usually causing only a slight 53 on individual species.However, when changes occur at a fast pace。。。 ”这里的however表明前后的句意应该是相反的，后面说“However, when changes occur at a fast pace, ”，那前面所提到的变化就不是急剧的，而是平缓逐步的，所以要填gradual，根据常识也可知道，自然界在不受人类活动的影响下变化是缓慢渐进的，而这种缓慢的变化对物种所造成的影响是很轻微的，所以填impact（影响），anxiety（焦虑）代入句子后句意不同。
“62 , although tropical forests may look as though they are thick and healthy, they are 63 highly susceptible (易受影响的）to destruction. This is because the soils in which they grow 64 nutrients...animal species will disappear. ”整个这一部分是在说一个例子，来证明人类活动对物种濒危所造成的影响， “In short”意为简而言之，一般用来引出总结句，用在这里显然不对。找教案网
