网址：http://m.1010jiajiao.com/timu3_id_3128382[举报]
leaving Earth.Three Russian astronauts will join three colleagues from other countries as they are locked
up together for a year and a half on a simulated(模仿的) mission to Mars.The mission is called Mars
500.
The Mars500 mission at Moscow's Institute of Biomedical Problems will test the psychological and
physical effects of longterm isolation on humans.
The group's leader, engineer Sytev, looks at the threesquaremeter place that will be his personal
habitation."This phone will work for only 11 days.When we are near the Earth, it will be switched off, "
said Sytev.Sytev is a newlywed.He says the most difficult thing will be to be separated from his wife and
the persons around him.He finds it difficult to leave some of his habits behind-all their activities will be
directed towards a certain goal and that he won't see sunsets, sunrises, won't feel rain for 18 months.
After 250 days, three of the astronauts will simulate landing on Mars.The other three will wait for
them-in the mock spacecraft-for a month.All communication with Earth will be via email and will have as
much as a 40minute delay, like on a real Mars mission.
Suvorov is a physician.He and other scientists will monitor the astronauts."This experiment is unique
because the six persons will be isolated for a long period of time, " noted Suvorov."They will have to
make decisions on their own and only then report to the Earth, and the Earth will tell them whether they
did the right thing or not."He says the experiment will pave the way for a real Mars journey later this
century."We are going to determine how much food and other products of daily use are needed, and
how people of different cultures, of different training can find common language and work on performing
their tasks, " added Suvorov.
Mars500 is the third in a series of flight simulations.The earlier ones were shorter.The current
experiment is set to end in November 2011.
1. The underlined word "mock" in Paragraph 4 means ________.
A. simulated B. advanced
C. small D. comfortable
2. What do we learn about the Mars500 mission according to the text?
A. The base is located in New York, America.
B. It is a simulation program designed for the future space expedition.
C. All astronauts will spend 18 months in the spacecraft.
D. Astronauts can't use any mobile phone during the experiment.
3. What is the most difficult thing that Sytev will face during their training?
A. Standing the isolation and loneliness.
B. There existing a 40minute delay.
C. Lacking food and other products.
D. Being monitored by Suvorov and other scientists.
4. We can learn from Suvorov's words that ________.
A. it's hard for the astronauts to perform their tasks together
B. more experiments will be carried out for a real journey
C. the astronauts should learn to make decisions on their own
D. different cultures of the astronauts don't matter any more
In order to protect valuable energy, snails(蜗牛) basically play a game of follow-the-leader, a new study finds. Snails create trails of mucus(黏液) to help them move smoothly across the ground, mainly in search of food or a partner, but making all that mucus uses up a lot of energy.
“Snails use a lot of energy, probably a third, creating mucus,” said Mark Davies of the University of Sunderland, lead author of the study published in the journal Proceedings of the Royal Society. “This process is very tiring indeed— much more so than walking, swimming or flying.”
Davies and his workmates studied marine snails off the coast of Britain and discovered that to save some of this important energy, the snails sometimes follow the existing mucus trails laid down by other snails to get around and so only have to create a small part of the mucus needed to make a new trail.
“The fact that they can make savings has an effect on as much as they have to save more energy to do other things like reproducing,” Davies said.
The energy saving may also help snails which live in environments where food is not enough, making the energy harder to replace.
Biologists had long guessed that snails behaved this way, but this is the first study to directly observe it. Davies said that it is likely that all snails use this means of cutting energy as they work hard through life.
45. What’s the function of mucus that snails create?
A. To find their food B. To find their way back
C. To save their energy D. To help them move smoothly
46. According to the passage, which of the following statements is TRUE?
A. The snail’s life is very hard.
B. The snails don’t need much to reproduce.
C. This is the first time to do the guess.
D. The snails will replace more energy in places lacking food.
47. From the passage we know that ______.
A. snails’ trails are sometimes reused
B. snails’ food is difficult to find
C. snails can live a long life
D. only marine snails have the ability
48. What does the passage mainly talk about?
A. How snails move and work.
B. Snails save energy by reusing mucus trails.
C. A new study finds the mysteries of snails.
D. Snails make full use of their energy.
查看习题详情和答案>>The “balance of nature”is not an empty phrase. Nature provides a population to occupy a suitable environment and cuts down surplus population to fit the available food supply. One means of reducing surplus population is predators; others are parasitic diseases. Also, population density produces nervous disorders and even drives animals to mass migrations(移民群),like the lemmings of Norway who plunge（冲入）into the sea.
That predatory population increase to control other animals has long been known. Many years ago, the Hudson’s Bay Company records revealed that the fox population went up and down about a year after rabbit population had gone up and down.
Sometimes a situation occurs in which the predatory population is reduced to a level below which nature can readily replace. On Valcour Island in Lake Champlain, a costly campaign resulted in the elimination（消除）of predatory animals only to have birds and small animals increase for four years afterward. Then, lacking predator control, nature resorted to disease to cut down these populations.
Jamaica had an example of nature’s persistence in providing animals for existing habits. Sugar planters, about 75 years ago, imported mongooses（狐猴）to control rats. The mongooses killed off the rats, kids, puppies, and wildlife. Eventually, food became scarce and the mongoose’s population declines.
1. The fact that the number of predators has much to do with that of other animals .
A. is not recent knowledge B.has just been learned
C.hasn’t been proved yet D.is not important now
2. When predator control fails, nature brings animal population into balance by .
A. eliminating the number of predators
B.seeking the help of disease to reduce other animals
C.increasing the number of other animals
D.replacing the number of predators immediately
3. When the mongooses killed off the rats they .
A. became problems themselves B.ate the sugar crop
C.attacked humans D.had nothing to eat
4. It is implied in this passage that .
A. sugar planter imported mongooses to control rats
B.man should never kill animals
C.man has complete control over nature
D.to upset the balance of nature can be troublesome
查看习题详情和答案>>
One morning a few years ago，Harvard President Neil Rudenstine overslept. For this busy man，it was a sort of alarm: after years of non-stop hard work，he might wear himself out and die an early death.
Only after a week's leave—during which he read novels, listened to music and walked with his wife on a beach—was Rudenstine able to return to work.
In our modern life, we have lost the rhythm between action and rest. Surprisingly, within this world there is a universal but silly saying:“I am so busy.”
We say this to one another as if our tireless efforts were a talent by nature and an ability to successfully deal with stress. The busier we are, the more important we seem to ourselves and, we imagine, to others. To be unavailable to our friends and family, and to be unable to find time to relax—this has become the model of a successful life.
Because we do not rest, we lose our way. We miss the guide telling us where to go, the food providing us with strength, the quiet giving us wisdom.
How have we allowed this to happen? I believe it is this: we have forgotten the Sabbath, the day of the week—for followers of some religions—for rest and praying. It is a day when we are not supposed to work, a time when we devote ourselves to enjoying and celebrating what is beautiful. It is a good time to bless our children and loved ones, give thanks, share meals，walk and sleep. It is a time for us to take a rest, to put our work aside, trusting that there are larger forces at work taking care of the world.
Rest is a spiritual and biological need；however，in our strong ambition to be successful and care for our many responsibilities，we may feel terribly guilty when we take time to rest. The Sabbath gives us permission to stop work. In fact, “Remember the Sabbath ”is more than simply permission to rest；it is a rule to obey and a principle to follow.
50. The “alarm” in the first paragraph refers to “______”.
A. a signal of stress B. a warning of danger
C. a sign of age D. a spread of disease
51. According to Paragraph 4,a successful person is one who is believed to ____.
A. be able to work without stress B. be more talented than other people
C. be more important than anyone else D. be busy working without time to rest
52. Some people feel guilty when taking time to rest because they ____.
A. think that taking a rest means lacking ambitions
B. fail to realize that rest is an essential part of life
C. fail to realize that religions force them to rest
D. think that taking a rest means being lazy
53. What is the main idea of this passage?
A. We should balance work with rest.
B. The Sabbath givers us permission to rest.
C. It is silly for anyone to say “I am so busy.”
D. We should be available to our family and friends.
查看习题详情和答案>>
One morning a few years ago, Harvard President Neil Rudenstine overslept. For this busy man, it was a sort of alarm: after years of non-stop hard work, he might wear himself out and die an early death.
Only after a week’s leave—— during which he read novels, listened to music and walked with his wife on a beach—— was Rudenstine able to return to work.
In our modern life, we have lost the rhythm between action and rest. Amazingly, within this world there is a universal but silly saying: “I am so busy.”
We say this to one another as if our tireless efforts were a talent by nature and an ability to successfully deal with stress. The busier we are, the more important we seem to ourselves and, we imagine, to others. To be unavailable to our friends and family, and to be unable to find time to relax—— this has become the model of a successful life.
Because we do not rest, we lose our way. We miss the guide telling us where to go, the food providing is with strength, the quiet giving us wisdom.
How have we allowed this to happen? I believe it is this: we have forgotten the Sabbath, the day of the week—— for followers of some religions—— for rest and praying. It is a day when we are not supposed to work, a time when we devote ourselves to enjoying and celebrating what is beautiful. It is a good time to bless our children and loved ones, give thanks, share meals, walk and sleep. It is a time for us to take a rest, to put our work aside, trusting that there are larger forces at work taking care of the world.
Rest is s spiritual and biological need; however, in our strong ambition to be successful and care for our many responsibilities, we may feel terribly guilty when we take time to rest. The Sabbath gives us permission to stop work. In fact, “Remember the Sabbath” is more than simply permission to rest; it is a rule to obey and a principle to follow.
The “alarm” in the first paragraph refers to “_______”.
A. a signal of stress
B. a warning of danger
C. a sign of age
D. a spread of disease
According to Paragraph 4, a successful person is one who is believed to _______.
A. be able to work without stress
B. be more talented than other people
C. be more important than anyone else
D. be busying working without time to rest
Some people feel guilty when taking time to rest because they _______.
A. think that taking a rest means lacking ambitions
B. fail to realize that rest is an essential part of life
C. fail to realize that religions force them to rest
D. think that taking a rest means being lazy
What is the main idea of this passage?
A. We should balance work with rest.
B. The Sabbath gives us permission to rest.
C. It is silly for anyone to say “I am busy.”
D. We should be available to our family and friends.
查看习题详情和答案>>