||Concern about extinction—the permanent loss of a species完形填空答案
|Concern about extinction—the permanent loss of a species完形填空答案|
|作者：佚名 文章来源：网络 点击数： 更新时间：2018/10/30 15:59:18 |
Concern about extinction—the permanent loss of a species—motivates a wide variety of people to take action to protect animal species at risk of dying out. Animal protection and animal rights are familiar themes associated with the field of environmental activism. Certainly, endangered animals suffer no lack of support.36.__D__
Surprisingly, some of the most endangered plants are species that, up until recently, were used by humans as necessary food crops.37.__C__
In order to maximize productivity, farmers have chosen to focus on a handful of highyield crops that can be harvested efficiently. At one time, the number of plant species used by humans to meet their nutritional requirements numbered above 7，000. Now, it is around 150. Some experts even claim that humans actually rely on just twelve species of plants for most of their food.
A single food crop generally contains several species, which may be further divided into hundreds of varieties, but these varieties are quickly disappearing. 38.__E__Eighty percent of the corn varieties grown in Mexico in 1930 have disappeared.Ninety percent of the 10，000 wheat varieties cultivated in China 1949 are no longer used.
39．__F__Crop diversity is a factor that ensures the continuation of certain beneficial natural processes in ecosystems—the cycling of nutrients, management of pests, and maintenance of water quality. 40.__B__Clearly, there is an urgent need to preserve the plant's irreplaceable crop diversity before it is lost completely.
A. You probably want to know the exact approach to protecting endangered plants.
B. Also, crop diversity provides the necessary gene pool to supply crops with a variety of traits(特点)．
C. Threatened by current shortsighted farming techniques, crop diversity has shrunk dramatically.
D. However, endangered plants are defended by few.
E. Examples of losses in crop diversity have been recorded worldwide.
F. The permanent loss of plant species represents a huge threat to humanity.
G. Thanks to modern farming techniques, many countries have taken measures to protect them.
When I first met my new parrot, Chico, his wings had been cut short. He couldn't fly and he was stuck on the__41__just like us humans. When the weather turned nice, I would take Chico outside. I__42__him on a branch of a tree, hoping to make him happier. At first he seemed confused.He walked back and forth on the branch looking__43__. He didn't even flap(拍打) his wings in a(n)__44__to fly. Somehow he knew he was incapable.
One day Chico got especially excited.He paced back and forth and made an incredible amount of noise. Then all of a sudden he stopped and__45__an even louder scream. He started__46__flapping his wings for the first time ever—then he__47__off the branch like a space shuttle! I was amazed and shocked.Little did I know his feathers had been growing back, and Chico had been waiting until the moment was ripe for__48__！
Two days later Chico returned.First I tried to__49__him back with food, but he would not come near me. Then I took his cage and__50__it away—still he would not come. Finally, I made him a firm__51__that I would let him out every day if the weather was nice as long as he did come back.__52__， he flew onto my shoulder.
From that day on, whenever the weather was good I would let him out__53__and he would fly around and be back before dark. The__54__lasted for two months until suddenly Chico became weak. The vet said that he had been infected with a__55__from the pigeons in the neighbourhood.Within a few days he died.
I was very sad.The__56__crossed my mind that if I had not set him free to fly, he would be still alive. But what__57__is there in being a bird if you can't fly?
Chico__58__his first breakthrough for freedom on a late Monday afternoon in April. When will you make yours? You too can__59__a chance when the conditions are right, knowing you too, in your own way, were built to fly. If you don't set yourself free, what will be the__60__of your life?
(C)41.A. cage B. scene C. earth D. stage
(B)42.A. brought B. seated C. caught D. chased
(C)43.A. delightful B. painful C. anxious D. guilty
(A)44.A. attempt B. order C. journey D. reason
【解析】鹦鹉甚至都没有拍动翅膀去尝试飞行，不知为什么它知道自己没有飞行的能力。in an attempt to do sth 企图/试图做某事。
(D)45.A. gave away B. took on C. laid out D. let out
【解析】这里指鹦鹉发出尖叫之声。give away 赠送，分发； take on呈现，雇佣，承担，接纳； lay out铺开，展开，布置； let out发出(叫声等)。
(B)46.A. proudly B. madly C. slowly D. gracefully
(D)47.A. cut B. fell C. knocked D. lifted
(C)48.A. struggle B. exchange C. escape D. rescue
(A)49.A. trick B. fasten C. seize D. expect
(C)50.A. burnt B. drove C. put D. threw
【解析】解析见上题。put sth away 把……收起来。
(B)51.A. contract B. promise C. hand D. feather
(D)52.A. Once in a while B. As usual C. In the meantime D. At last
(A)53.A. early B. lately C. sometimes D. lonely
(C)54.A. practice B. deed C. routine D. recreation
(B)55.A. spirit B. disease C. relationship D. diet
【解析】be infected with被传染/被感染……。
(A)56.A. thought B. fact C. concern D. detail
(D)57.A. profit B. mistake C. interest D. meaning
(C)58.A. discovered B. demonstrated C. achieved D. announced
【解析】make/achieve a breakthrough 取得突破性进展，此处指鹦鹉为自由而奋斗。
(D)59.A. lose B. envy C. deserve D. take
【解析】take a chance抓住机会。
(B)60.A. success B. purpose C. contribution D. entertainment
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