题目内容
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.
72. 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
73. 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
74. 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
75. 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
阅读快车系列答案阅读下面短文，掌握其大意，然后从36-55所给的四个选项（A、B、C、D）中，选出最佳选项。
There is a beautiful story about a child playing with a vase his mother had left on the table for a few moments. When the mother turned 16 the sound of her son’s crying she saw that his 17 was in the vase and was apparently stuck. She 18 to help him and pulled and pulled until the child cried out 19 . But the hand was stuck fast（牢固地）. How would they get it out? The father suggested 20 the vase but it was quite valuable and the child’s hand might be cut in the 21 _. Yet he knew that if all else 22 there would be no other alternative.
So he said to the boy, “Now, let’s make one more 23 . Open your hand and stretch your 24 out straight, as I’m doing, and then pull!” “ 25 Dad,” said the boy, “if I do that I’ll 26 my penny!”
The boy had had a coin in his hand 27 and was holding it 28 in his tight little fist. And he wasn’t 29 to open his hand and lose it. But 30 he opened his hand it came out of the vase easily.
The father said to the boy, “What are you holding onto so tightly as to hinder (阻碍) your walk with God? That vase can be 31 to the entrance to the Kingdom of God. It is narrow yet quite 32 to pass in, but first you must open your hand to God and 33 earthly（世俗的）things to fall. If we keep our fists 34 and hold fast to what we have and keep it for ourselves, we will be unable to 35 hold of the hand of God. Open your hand to the hand of God and you will see great things take place.”
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完形填空 （共20小题；每小题1分，满分20分）
The moment happened 30 yours ago but it was still fresh in my memory. I was a college freshman and had 26 up most of the night before laughing and talking with friends. Now just before my first 27 of the day my eyelids were feeling heavier and heavier and my head was drifting down to my desk to make my textbook a 28 . A few minutes nap（小睡）time before class couldn’t 29 , I thought.
BOOM! I lifted my head suddenly and my eyes opened wider than saucers. I looked around with my 30 beating wildly trying to find the cause of the 31 . My young professor was looking at me with a boyish（孩子气的）smile on his face. He had 32 dropped the textbooks he was carrying onto his desk. “Good morning!”, he said still 33 . “I am glad to see everyone is 34 . Now let’s get started. ”
For the next hour I wasn’t sleepy at all. It wasn’t from the 35 of my professor’s textbook alarm clock either. It was instead from the 36 discussion he led. With knowledge and good 37 he made the material come 38 . His insight was full of both wisdom and loving-kindness. And the enthusiasm and joy that he 39 with were contagious（有感染力的）. I 40 the classroom not only wide awake, but a little 41 and a little better as well.
I learned something far more important than not 42 in class that day too. I learned that if you are going to do something in this life，do it well，do it with 43 . What a wonderful place this would be if all of us did our work happily and well. Don’t sleepwalk（梦游）your way through 44 then. Wake up! Let your love fill your work. Life is too 45 not to live it well.
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