Worms.antis.and flowers live in soil．Fish.crabs.and seaweeds live in oceans．Birds.insects.and moss live in trees．soil.oceans.and trees are habitats一places where animals and plants live ．Besides of 题目和参考答案——青夏教育精英家教网—

题目内容

Worms，antis，and flowers live in soil．Fish，crabs，and seaweeds live in oceans．Birds，insects，and moss live in trees．soil，oceans，and trees are habitats一places where animals and plants live ．Besides offering food and shelter, habitats allow for growth and reproduction．

Humans, however，have destroyed many habitats．We change forests into parking lots. We turn grasslands into neighborhoods．We turn beach land into resorts．We turn 0ceans into chemical dumps．Some plants and animals adapt and survive．Others，however die．The changes are too much，too fast．Sometimes the death rate becomes greater than the birth rate．then the extinction occurs．An example of this happened on Florida's east coast，the habitat of the dusky seaside sparrow．This habitat changed suddenly as land was developed. And the sparrows were not able to adapt. More sparrows died than were born. In 1987 the dusky seaside sparrow became extinct ．None exist in the world today．

Fortunately，conservation efforts are underway．Many states have set aside land for nature preserves. Here，plants and animals live in their natural habitats．Some states have created man-made habitats ．Artificial reefs，for example，have been put in ocean waters. The artificial reefs are habitats for hundreds of fish and other marine life．In 1970 the federal government passed a law to protect habitats．'Ibis～that the efforts of development must be studied．A highway，dam，or power plant may not be built if plants and animals，endangered．We were too late to save the dusky sparrow．Hopefully，however，these new efforts will save other plants and animals．

63．This passage is concerned with＿．

A. federal laws

B. the dusky seaside sparrow

C. habitat protection

D. artificial reefs

64．The worst that can happen when habitats are destroyed is that plants and animals

A. live in their natural habitats

B. become extinct

C. adapt and survive

D. move to new habitats

65．The author’s feeling about conservation efforts is one of＿.

A. surprise

B. disrespect

C. hope

D. enthusiasm

66. The author explains the effects of habitat destruction by presenting a＿.

A. real-life example

B. personal narrative

C. scientific study

D. made-un story

CBCA

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Ero Carrera is watching the computer screen in a lab in California as he tracks a new computer virus slowly circling the globe, targeting cell phones. Working from the US office of the Finnish computer 21 firm, Carrera knows this virus could be the start of something big and 22 . He’s one of a couple of hundred “virus hunters” worldwide who guard computers and cell phones from 23 . That’s the job for these unlikely action heroes of the Internet age, where quick and curious minds are more important than strong 24 .

Carrera works with Tzvetan Chaliavski to form the two-man team in California. Like that of other employees in the anti-virus companies in the world, their work is at the battle front of providing 25 from the damaging of computer virus, worms and Trojans. They break down software to discover a new virus and crack its code. Then they 26 and ship out a software update to customers. Roughly 300 new samples of viruses await the pair on a(n) 27 day.

Carrera has created a mathematical formula(公式), to 28 easily the software structure of viruses. With it, he is better able to compare the many variants(变种) and families of malware(恶意软件). To his 29 , Chaliavski, it doesn’t even matter why someone would create a virus. All that 30 is the hunt.

21. A. advertising B. commercial C. printing D. security

22. A. admiring B. exciting C. inviting D. threatening

23. A. attack B. bombing C. competition D. struggle

24. A. heads B. feelings C. muscles D. spirits

25. A. access B. contact C. measures D. protection

26. A. copy B. create C. delete D. download

27. A. average B. original C. previous D. special

28. A. get off B. make out C. pick up D. take in

29. A. assistant B. manager C. partner D. secretary

30. A. ignores B. matters C. overlooks D. rejects

阅读下面短文, 掌握其大意, 然后从1—10各题所给的从A、B、C和D四个选项中, 选出可以填入空白处的最佳选项。

Ero Carrera is watching the computer screen in a lab in California as he tracks a new computer virus slowly circling the globe, targeting cell phones. Working from the US office of the Finnish computer 1 firm, Carrera knows this virus could be the start of something big and 2 . He’s one of a couple of hundred “virus hunters” worldwide who guard computers and cell phones from 3 . That’s the job for these unlikely action heroes of the Internet age, where quick and curious minds are more important than strong 4 .

Carrera works with Tzvetan Chaliavski to form the two-man team in California. Like that of other employees in the anti-virus companies in the world, their work is at the battle front of providing 5 from the damaging of computer virus, worms and Trojans. They break down software to discover a new virus and crack its code. Then they 6 and ship out a software update to customers. Roughly 300 new samples of viruses await the pair on a(n) 7 day.

Carrera has created a mathematical formula(公式), to 8 easily the software structure of viruses. With it, he is better able to compare the many variants(变种) and families of malware(恶意软件). To his 9 , Chaliavski, it doesn’t even matter why someone would create a virus. All that 10 is the hunt.

A. advertising B. commercial C. printing D. security

A. admiring B. exciting C. inviting D. threatening

A. attack B. bombing C. competition D. struggle

A. heads B. feelings C. muscles D. spirits

A. access B. contact C. measures D. protection

A. copy B. create C. delete D. download

A. average B. original C. previous D. special

A. get off B. make out C. pick up D. take in

A. assistant B. manager C. partner D. secretary

A. ignores B. matters C. overlooks D. rejects

21. A. advertising B. commercial C. printing D. security

22. A. admiring B. exciting C. inviting D. threatening

23. A. attack B. bombing C. competition D. struggle

24. A. heads B. feelings C. muscles D. spirits

25. A. access B. contact C. measures D. protection

26. A. copy B. create C. delete D. download

27. A. average B. original C. previous D. special

28. A. get off B. make out C. pick up D. take in

29. A. assistant B. manager C. partner D. secretary

30. A. ignores B. matters C. overlooks D. rejects

阅读理解

     You are only as old as you feel, it is said. But soon scientists will be able to calculate your real
"physiological (生理的) age".
     Researchers studying genes believe they can now tell exact physiological age by looking at a
number of clues in DNA. They don't have to ask people how they feel or look at their appearance.
     The breakthrough could solve the mystery of why some 70-year-olds function at the level of those
in their 50s, while others become weak sooner than you would think.
     The researchers made the breakthrough by finding the "biomarkers" of aging in tiny worms.
     The worms they studied had an average lifespan (寿命) of three weeks. Like humans, some remain
lively much longer than other similarly-aged worms, while others show signs of premature aging.
     By genetically profiling (基因识别) 104 different worms at various ages, the researchers found a
group of genes that are involved in the aging process.
     'This is a first step; our results were not perfect, but we were able to predict the ages of the animals
70 percent of the time, which is far better than anything that has been done before," said Simon Melov,
the lead researcher at Buck Institute for Age Research in California.
     Now they want to extend their studies to mice and eventually humans.
     "I am confident that at some point there will be a non-subjective method of determining how old
someone is with a high level of confidence," said Melov.
     The speed at which people age depends on a number of things including genetic inheritance (遗传),
lifestyle and mental health.
     Determining chronological (按时间顺序的) age in both worms and humans is easy - count forward
from birth. But determining physiological age has remained subjective ? based on how someone looks
or functions.
     The findings have major implications for age research in humans. Examining biomarkers over time
would provide a scientific basis for anti-aging medicines. The technology would also provide a means
of determining whether a person is aging faster or slower than people would normally think.

1. How can researchers tell one's exact physiological age?

A. By looking at their appearance.
B. By asking people how they feel.
C. By looking at a number of clues in DNA.
D. By finding the "biomarkers" of aging in tiny worms.

2. What did the researchers base their survey on as their first breakthrough?

A. Humans.
B. Worms.
C. Mice.
D. Lifespan.

3. The researchers found__________.

A. some 70-year-olds function become weak sooner than expected.
B. anyone was as old as he was feeling.
C. a group of genes were involved in the aging process.
D. the speed at which people age only depends on their genetic inheritance.

4. What is the best title of the passage?

A. Genetically profiling
B. Find your true age
C. Worms and humans
D. Research in humans

You are only as old as you feel，it is said．But soon scientists will be able to calculate

your real” physiological（生理的）age”．

Researchers studying genes believe they can calculate exact physiological age by looking at a number of clues in DNA．They don’t have to ask people how they feel or look at their appearance．

The breakthrough could solve the mystery of why some 70-year-olds function at the level of those in their 50s，while others become frail（虚弱的）sooner than you would think．

The researchers made the breakthrough by finding the“biomarkers”of aging in tiny worms（虫子）．

The worms they studied had all average lifespan（寿命）of three weeks．Humans’ some remain live much longer than other similarly-aged worms，while others show signs of premature aging．

By genetically profiling（基因识别）104 different worms at various ages，the researchers found a group of genes that are involved in the aging process．

“This is a first step ;our results were not perfect，but we were able to predict the ages of the animals 70 percent of the time，which is far better than anything that has been done before．”said Sireon Melov the lead researcher at Buck Institute for Age Research in California.

Now they want to extend their studies to mice and eventually humans．

“I am confident that at some point there will be a non-subjective（主观的）method of determining how old someone is with a high level of confidence，”said Melov．

The speed at which people age depends on a number of things including genetic inheritance（遗传），lifestyle and mental health．

Determining chronological（按时间顺序的）age in both worms and humans is easy-count forward from birth．But determing physiological age has remained subjective－based on how someone looks or functions．

The findings have special meanings for age research in humans．Examining biomarker over time would provide a scientific basis for anti—aging medicines．The technology would also provide a means of determining whether a person is aging faster or slower than people would normally think．

1．The passage mainly talks about

A．the new finding of gene studying

B．the relationship between genes and the age

C．the breakthrough in mental health

D．biomarkers of aging, in tiny worms

2．The researchers’ next goal is to study

A．tiny worms B．biomarkers C．humans D．mice

3．Which of the following statements is TRUE?

A．The researchers have found biomarkers of ageing in humans．

B．The researchers are able to predict the ages of the humans 70 percent of the time．

C．People’s aging depends oil genetic inheritance，lifestyle and mental health，etc．

D．There will be a simple method of determining how old someone is．

4．In the future，scientists will ____

A．produce effective anti-ageing medicines

B．find a group of genes that are involved in the ageing process

C．determine physiological age subjectively

D．set up an institute to calculate humans’ real age

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