第二节:完形填空(共20小题;每小题1分,满分20分)
阅读下面短文,掌握其大意,然后从21 – 40 各题所给的四个选项(A, B, C, 和D)中,选出最佳选项,并在答题纸上将该选项标号涂黑。
It was so cold that I couldn’t feel my legs. There was going to be a racing contest that night so I was 21 my horse, Skippy, up. I was simply running laps(跑道的圈) around the ring. The  22  cold air had been blowing past me, freezing my limbs, but every second I  23  it. You could hear the faint  24  of the people up at the clubhouse eating their dinner. My parents were also there, not knowing that my little sister had slowly wandered her way down to the ring. It was  25  because there was no moon or stars. Nobody else was in the ring at the time. I was really enjoying the 26  and I was able to  27  what Skippy was doing. As I took my last lap it  28 . Everything rapidly slowed down as I saw my little sister step  29   the ring. I saw true fear on her face because she knew she wouldn’t be  30  to move out of the way fast enough. She knew that she was going to get hit.
She tried to  31  but nothing came out of her fear-dried throat. When my horse got to her, he was still in a full out run.  32 , miraculously(奇迹般地), he slid so hard on his back feet that he  33 . It really made the  34  seem absolutely unreal. I thought that maybe I was  35 . I had  36  in my mind that I wasn’t seeing what was happening. I knew I had hit my sister. There was no way I could have  37  her. My horse was rising straight up and while he was in the air I couldn’t breathe. It’s like I forgot  38 . As all of this happened I watched my sister’s face transform (变形) through many different  39 : terror, confusion, curiosity, and then a sort of relief. Then she was laughing.
As I held my sister into my arms, Skippy stood right behind me knowing that I actually owed him my life  40  he saved my sister’s.
21.A. picking                B. warming                  C. catching                   D. setting
22.A. bitterly                B. hardly                      C. gently                      D. perfectly
23.A. challenged                  B. witnessed                 C. enjoyed                    D. hated
24.A. ceremony                   B. tradition                   C. victory                            D. laughter
25.A. windy                        B. bright                      C. dark                         D. cloudy
26.A. quiet                          B. quality                            C. impression                D. significance
27.A. rely on                   B. focus on                   C. insist on                   D. put on
28.A. let out                 B. held on                    C. participated in               D. took place
29.A. close to               B. out of                      C. into                         D. towards
30.A. able                 B. frightened          C. content                     D. proud
31.A. evaluate               B. worry                      C. scream                            D. escape
32.A. Accidentally         B. Normally                 C. Generally                 D. Somehow
33.A. sped up               B. rose up                        C. broke down                     D. wore out
34.A. moment               B. contest                            C. comment                  D. technique
35.A. advancing                   B. breathing                  C. concluding               D. dreaming
36.A. that                            B. none                        C. neither                            D. it
37.A. hit                      B. recognized                C. missed                            D. acknowledged
38.A. how                           B. what                        C. when                       D. why
39.A. actions                B. emotions                  C. attitudes                   D. thoughts
40.A. if                               B. because                    C. as if                         D. so that

Now let's look ourselves as a species in relation to ecosystem balance.Modern scientists believe that humankind, like other animals, evolved(进化) through millions of years of changes and adaptations to the environment and that our most direct evolutionary ancestor was probably an earlier species of the primate(monkey, ape) group. Despite this similarity with other creatures, however, the evolution of humankind differs from that of other species in one important and unique way.

In other species, evolution has led to specialization, both in the species abilities and in its place within the environmental structure. For example, the giraffe is much adapted to feeding on treetops, but it is also specialized and thus limited to feeding on trees and shrubs. Only with great difficulty can it bend down to graze on the ground. Similarly, the anteater is extremely well adapted to eating ants but is unable to catch or eat other animals. The same is true for countless other species.

For humankind it is opposite. Our evolution had led to a very generalized ability. Our highly developed intelligence and ability to make and handle tools mean that we can do almost anything. Humans evolved in such a way that we are able to move into every environment on Earth and even into space. No natural competitor offers great resistance, and other natural enemies such as disease have been controlled.

Said another way, we see in humankind a great imbalance between biological potential and environmental resistance. The result is the rapidly increasing world population, frequently referred to as the population explosion. Further, to support our growing population, natural ecosystems are being increasingly displaced by human habitations, agriculture, and other human supporting activities.

1.From the passage we can infer that in the course of evolution _______.

A. humankind is very important to earlier species, such as the primate group

B. human beings are limited by the environment while animals are not

C. human beings become more and more different from each other

D. humankind has experienced a generalization rather than specialization in ability

2.According to the passage, primate includes such animals as _______.

A. monkeys and anteaters                    B. tigers and apes 

C. apes and monkeys                         D. monkeys and giraffes

3.According to the passage, evolution has made it possible for humans to _______.

A. increase the population                     

B. resist natural offers 

C. go to the moon                          

D. cure all diseases

4.According to the author, imbalance between biological potential and environ mental resistance has resulted in _______.

A. the population explosion                    

B. the destruction of human habitations

C. the growth of natural ecosystem             

D. the specialization of humans

 

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