We had known for along time that flowers of different plants open and close at different time of day. Yet no one really understands why flowers open and close like this at special time. The question is not as simple as we might think, as recent experiments have shown. In one experiment, flowers were kept in constant (持續(xù)的）darkness. We might expect that the flowers ,without any information about the time of the day, did not open as they usually do. In fact, they continue to open at their usual time. This shows that they have some special ways of knowing the time. Their sense(感覺) time does not depend on information from the outside world. It is inside them: a kind of "inner (內部的）clock". This discovery may not seem to be very important. However, it is later found that not just plants but animals have this "inner clock" which control（控制）the working of their bodies and influences their activities. Human beings, then, are also influenced by it. Whether we wish or not, itaffectssuch things in our life as our need for sleep or need for food.
小題1:Before the experiment arrived at a conclusion, people had thought that the flowers would____.
A．never open in constant darkness
B．change their usual time to open
C．open ahead of the time as they usually did
D．continue to open at usual time
小題2:The sense of time that flowers have is connected with_____________.
A．its age and size
B．light and temperature
C．a(chǎn) kind of strange power(力量）inside them
D．some unknown information from the outside world
小題3:What will happen if we make good use of the "inner clock"
A．We'll need less sleep or food.
B．We'll be able to sleep as long as we wish to.
C．We'll be able to change our work time when necessary.
D．We'll have more energy to do our work better.
小題4:What's the Chinese meaning of the underlined word" affects"
A．產(chǎn)生B．影響C．給予D．依賴

小題1:A
小題2:C
小題3:D
小題4:B
本篇文章從對開花時間的研究引出植物和人類都有生物鐘這個結論。
小題1:A 細節(jié)題。根據(jù)In one experiment, flowers were kept in constant (持續(xù)的）darkness. We might expect that the flowers ,without any information about the time of the day, did not open as they usually do.可知答案為A.
小題2:C細節(jié)題。根據(jù)Their sense(感覺) time does not depend on information from the outside world. It is inside them: a kind of "inner (內部的）clock".可知答案為C.
小題3:D推斷題。根據(jù)However, it is later found that not just plants but animals have this "inner clock" which control（控制）the working of their bodies and influences their activities. Human beings, then, are also influenced by it.可推斷如果我們好好的利用生物鐘，我們就有更多的精力工作。
小題4:B猜詞題。不管我們是否希望，生物鐘影響了我們睡覺吃飯那樣的事情。
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Brown says she doesn’t mind handling panda poop. “It’s probably the most pleasant material to work with,” she says, “My colleagues and I have been working with other poop for a long time, and we can assure you it has a fairly pleasant smell associated with it.”
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B．to explore a new way to get energy from plants
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D．to figure out how the bacteria work for us mankind
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a. Identify the chemicals helpful to break down biomass.
b. Find the bacteria in panda poop which break down bamboo.
c. Reproduce the chemicals in the lab to turn biomass into energy.
d. Analyze how the bacteria in panda poop work in panda’s stomach.
A. a, b, d, c          B. a, d, c, b          C. b, a, d, c          D. b, d, a, c
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A．Pandas don’t digest bamboo the same way as cows.
B．Pandas are capable of getting energy using stomachs.
C．Pandas can get energy from bamboo more efficiently.
D．Scientists have learnt something new from panda poop.
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Root hairs explore the soil in much the same way a person would feel their way in the dark. If they come across an obstacle, they make their way around until they can continue growing in an opening. In the meantime, the plant is held in place as the hairs grip(緊緊抓住)the soil.
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This system gives plants the flexibility to explore a complex environment and to live in even the most unpromising soils, says Dolan.
In poor soils such as in parts of Australia and Africa, native plants have adapted by producing enormous numbers of root hairs. A better understanding of this adaptation will allow scientists to develop hairy rooted crops that can grow in unfriendly environments.
According to Dolan, “Research in the John Inners Center is taking a breeding approach to increase hair length in wheat but it will be some time before new cultivars(栽培變種) are developed.”
小題1:The passage is mainly about _______.
A．why the roots of plants grow into the soil but not above it
B．how the roots of plants grow into the soil but not above it
C．the process of plants growth
D．a(chǎn) growth control system of plants
小題2:How does the circle work?
A．RHD2 takes calcium from the soil, which makes hairs grow, and produce RHD2 and take more calcium
B．Roots take RHD2 and calcium from the soil and produce RHD2
C．Roots make hairs grow, and produce RHD2, and take more calcium
D．RHD2 takes protein, which makes hairs grow, and produce RHD2, and take more calcium
小題3:We can infer from the last paragraph that ________.
A．hairy rooted crops can grow better in unfriendly environments
B．a(chǎn) new cultivar of wheat with long hair has been developed by scientists
C．a(chǎn) new cultivar of wheat with long hair is still on test
D．the roots of plants always know which way to grow

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