In these days of technological triumphs, it is well to remind ourselves from time to time that living mechanisms are often incomparably more efficient than their artificial imitations. There is no better illustration of this idea than the sonar system of bats. It is billions of times more efficient and more sensitive than the radars and sonars designed by man.
17. The author suggests that the sonar system of bats ____
A) was at the height of its perfection 50 million years ago
B) is better than man-made sonar because it has had 50 million years to be be refined
C) should have been discovered by man many years ago
D) is the same as it was 50 million years ago
注:B 选项体现一段结尾和二段开头,应该优选,含有关系词 because,although,not only...but also, as well as 的应该优选
18. Echo location in this article means the _____.
A) location of echoes
B) ability to determine where an echo comes from
C) scientific term for sound waves
D) ability to locate unseen objects by echoes
注:1.A 为干扰选项,过于表面化
2.B 项为等价选项所以为错误
To appreciate the precision of the bats echo location, we must first consider the degree of their reliance upon it. Thanks to sonar, an insect-eating bat can get along perfectly well without eyesight. This was brilliantly demonstrated by the Italian naturalist
Lazzaro Spallanzani. He caught some bats in a bell tower, blinded them and released them outdoors. Four of these blind bats were recaptured after they had found their ways back to the bell tower, and on examining their stomachs contents, Spallanxani found that they had been able to capture and eat flying insects. We know from experiments that bats easily find insects in the dark of night, even when the insects make no sound that can be heard by human ears. A bat will catch hundreds of softbodied silent flying insects in a single hour. It will even detect and chase pebbles tossed the deficiencies of man-made sonar
B) the dependence of man upon animals
C) that we are living in a machine age
D) that the sonar system of bats is remarkable
注:写作目的题型,写作目的=写作动机+文章主题,看文章主题第一句话
20. The following is the main point of the article:____
A) A bat will catch hundreds of insects in a single hour.
B) There is a perfection in nature which sometimes can not be matched by mans creative efforts.
C) The phrase blind as a bat is valid.
D) Sonar and radar systems of man are inefficient.
注:写作主题题型,第一句话的同义改写 match v. 匹敌
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It takes two to tango 一个巴掌拍不响
In good nick 品质好、没有损坏
Glass-bottomed bridge, cancer risk for HRT and 120-year-old man 世界最长玻璃桥开放,荷尔蒙替代疗法增患癌风险,印度教120岁僧人
There's method to my madness 我有一个不合常理的办法
Bust a gut 拼了命地工作
Going forward 从今往后
Barefaced 厚颜无耻的
Clean up your act 改邪归正
To turn something upside down 把……翻个底朝天
In the blink of an eye 一眨眼之间
One good turn deserves another 以德报德,礼尚往来
Burn a hole in your pocket 有钱不花难受
Hot potato 棘手的问题“烫手山芋”
Cyclists make Olympic history, 400-year-old shark 英国自行车运动员创英奥运历史,400岁格陵兰鲨鱼
Pull something out of the hat 突施妙计
Earth-like planet, Pink cockatoo dies at 83 类地行星,83岁风头鹦鹉逝世
Bored at work? Sue the boss! 工作无聊怪老板?
Axe to grind 别有用心
Get someone's goat 火冒三丈
A cashless society 无现金社会