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Twins may be more common today than at anytime in history. Researchers analyzed records from 165 countries and found a significant rise in twin birth rates since the 1980s, with one in 42 people now born a twin. According to the survey, the global twin birth rate has risen by one-third, on average, over the past 40 years.

“The trends are really quite striking,” said Christiaan Monden, a professor at Oxford University. “Over the past 40 years we’ve seen a strong increase in twinning rates in rich and developed countries. Globally, twinning rates have risen from nine to twelve per 1,000 births since the 1980s, but the picture varies from country to country. The greatest rises are seen in North America (71%), Europe (60%) and Asia (32%). In the UK, twinning rates rose about 62%. In the Oxford study, a decrease of more than 10% was found in only seven countries over the dates surveyed. “The absolute number of twin deliveries (分娩) has increased everywhere except South America,” Monden said. “In North America and Africa, the numbers have increased by more than 80%, and in Africa this increase is caused almost entirely by population growth.”

Raj Mathur, a doctor at St. Mary’s Hospital in Manchester, said, “It doesn’t surprise us that twinning rates have increased because the availability of assisted reproduction (生殖) has increased and also because women are slightly older when they have their first children, and both those things will increase the twinning rate.”

“The majority of twin babies are completely fine, but there is no doubt that a twin pregnancy (怀孕) carries greater risks for the mother and the baby. So when we can avoid it, we should avoid it. The principle we follow is simply summed up by the phrase ‘one at a time’,” Mathur said.

【小题1】What do we know about the survey?
A.It saw a world population growth.B.It lasted nearly fifty years.
C.It was the first research about twins.D.It was based on plenty of data.
【小题2】Where can we hardly find the twinning rates rise?
A.South America.B.Asia.C.Europe.D.Africa.
【小题3】What can we infer from Mathur’s words?
A.It’s dangerous to be with child.B.It’s wise to bring up a single baby.
C.It’s best to have one baby at a birth.D.It’s unavoidable to give birth to a twin.
【小题4】What can be a suitable title for the passage?
A.The Principle of Delivering Babies
B.More Twin Babies Than Ever Before
C.No Doubt About the Present Twinning Rates
D.A Great Breakthrough in Human Reproduction
22-23高一下·四川泸州·期末
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Everybody in this world is different from one another. But do you know that understanding differences can help you better manage your money?

As we grow up, we gradually develop a set of our own values or beliefs. These are influenced by society, our family, the education we receive and so on. Once this value system is set up, it’s not easy to change later in life.

Financial (金融) experts say that everyone also has their own belief of how to manage their finances. This is part of our value system and it has a great impact on the way we look after our money.

According to our different values, experts put us in three categories. They are: the ant, the cricket and the snail.

The ant—works first

Just like ants who work heart and soul in summer in order to store food for winter, these people don’t care about enjoying the moment. They work very hard and save money they earn so that they can enjoy life when they get old and retire. The ant loves to save but they could make more out of their money if they were willing to invest(投资) in some funds and stocks with low risk.


The cricket—fun first
The cricket wants to enjoy everything now and doesn’t think too much about the future. They even borrow money when they really want something. Many young people now belong to this group. These people have little savings. When they get old, they might have problems. They should learn to save and buy insurance(保险).
The snail—lives under pressure(压力)

The snail refers to people who make life difficult for themselves. They take big long-term loans (贷款)from the bank in order to buy things such as luxury(奢华的) houses. They are happy to take big loans even though they are not sure they can afford it. This can cause problems in the future. They should plan more carefully.

【小题1】People with the character of the snail would like to _______.
A.enjoy life at the moment without thinking much about the future
B.live a luxury life at all costs
C.put work before everything else.
D.take the risk of investing a large sum of money
【小题2】Our beliefs and values are affected by the following except ______.
A.societyB.money
C.educationD.our family
【小题3】This passage mainly talks about _______.
A.the reaction between man and insects
B.the problems with dealing with money
C.the insects in nature
D.the spending nature of people
【小题4】Which of the following has the character that the author prefers?
A.The antsB.The cricket
C.The snailD.None of the above

Do you think it enough to have eight hours of sleep per might? Napoleon didn't agree with it. His saying went something like this: "Six hours for a man, seven for a woman and eight for a fool." But Napoleon's words weren't right, either. The ideal amount of sleep is different for everyone and depends on many factors, including age and genetic makeup.

In the past 10 years, my research team has surveyed sleep behavior in more than 150,000 people. About 11 percent slept six hours or less, while only 27 percent clocked eight hours or more. Most people fell in between. Women tended to sleep longer than men, but only by 14 minutes. Bigger differences are seen when comparing various age groups. Ten-year-olds needed about nine hours of sleep, while adults older than 30, including senior citizens, averaged about seven hours. We recently-found the first gene related to sleep length—if you have one kind of this gene, you need more sleep than if you have another.

Although it's common to hear warnings about .getting too much sleep—and 80 percent of the world uses an alarm clock to wake up on workdays—it's not difficult to figure out how much sleep we need. We sometimes overeat, but we generally cannot oversleep. When we wake up naturally, feeling comfortable, we have slept enough. In our modern society, we sleep about two hours less per night than 50 years ago. This sleep deprivation greatly decreases our work performance and harms our health and memory.

【小题1】What main point does the writer try to make in Paragraph 1?
A.Napoleon has his own sense of sleep time.
B.The quality of sleep time is more important.
C.Having 8 hours of sleep per night is common sense.
D.Different people needs different amount of sleep time.
【小题2】What do we know from Paragraph 2?
A.Women sleep much more than men.B.The older one is, the longer one sleeps.
C.Most people sleep between 6-and 8 hours.D.The sleep time is decided by gene.
【小题3】What does the underlined phrase “steep deprivation” in Paragraph 3 mean?
A.Too much sleep.B.A light sleep.C.No enough sleep.D.A deep sleep.
【小题4】Where does this passage probably come from?
A.A guidebook.B.A school report.C.A novel.D.A scientific research.

You try to keep your eyes wide open while watching a basketball match or a marvelous firework show in case you might miss something exciting in just the blink of an eye. But in fact, humans blink about 15 times per minute on average. Have you ever missed anything because you blinked? Probably not. Why is that?

According to a new study published in journal Current Biology in September, our brain has the ability to “skip” the temporary darkness that we see when we blink. It can keep visual information for a short period of time and then put it together to form a conclusive image without interruption.

In order to understand how this works, a group of scientists at the German Primate Center and the University Medical Center Gottingen in Germany conducted an experiment.

In the study, the participants were asked to look at patterns on a screen whose orientation(方向)could be shown in different ways, such as horizontally( 水平的) or vertically( 垂直的).When one pattern was about to disappear and the next one was about to come, the participants had to indicate the direction that the next pattern would be oriented in.

The researchers found that when the orientations of two patterns didn’t match, the medial prefrontal cortex(内侧前额叶皮层)--- the area in our brain which is responsible for visual memory---was activated. This same area showed less activity when two patterns were in the same direction.

“The medial prefrontal cortex adjust current visual information with previously obtained information, and thus enables us to see the world with more stability, even when we briefly close our eyes to blink,” Caspar Schwiedrzik explained in Science Daily. He is the first author of the study and also a scientist at the German Primate Center.

【小题1】What ‘s the author’s intention to write the first paragraph?
A.To bring out the topic.
B.To show the importance of blink.
C.To show some interesting event in his life.
D.To give suggestions on when we should blink.
【小题2】Why can’t we miss anything when blinking?
A.Because the time of the blink of an eye is too short.
B.Because our brain has the ability to “skip” the darkness.
C.Because our eyes can keep information and put it together.
D.Because the medial prefrontal cortex has a special function.
【小题3】The underlined word “activated” probably means .
A.be injuredB.be useless
C.start workingD.start being noticed

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