More and more people are taking their iPads to bed with them to surf the web, check Facebook or send emails before switching off the light. But researchers are warning that the blue light their screens give off can stop users getting a good night’s sleep. That is because this type of light is similar to daylight, convincing the brain that it is still daytime. Blue light prevents the production of a brain chemical called melatonin (褪黑激素)，which helps us fall asleep. By contrast, light which is more orange or red does not prevent melatonin production, perhaps because our brains recognize it as a cue (暗示)that the day ends.

Scientists have known for years that staring at screens late in the evening can affect sleep – be they television screens, computer screens or mobile phone screens. However, because mobiles and iPads are by nature portable – not to say addictive – more people are taking them into the bedroom. Users also tend to hold them much closer to their eyes than a computer or television screen.

Researchers are warning that looking at iPad displays for more than two hours leads to lower natural melatonin levels as the devices give off blue light. They say, “Turning off the devices at night is the final solution. But if you have to use these devices at night, dim the display to cut down irritation (刺激) of the eyes and limit the time you spend on them before bed.”

They wrote in the journal Applied Ergonomics that iPad makers should adjust the spectral power distribution (光谱功率分布) of the devices so that they affect the sleep patterns of users less.

It is not just a good night’s sleep that could be harmed by too much late night screen time. Researchers know that long-term harm to sleep patterns can lead to an increased risk of obesity and even cancers.

64. Blue light prevents iPad users from sleeping well because ________.

       A. it makes the brain more active

       B. it can help decrease the production of melatonin

       C. it is brighter than light that is more orange or red

       D. it is the same as daylight which keeps people awake

65. The underlined phrase “dim the display”  means ________.

       A. turn off the display                       B. keep away from the display

       C. clean the display carefully                  D. make the display less bright

66. In the last paragraph, the author intends to ________.

       A. show the danger of obesity and cancers

       B. call on researchers to study sleep patterns

       C. warn of the seriousness of long-term poor sleep

       D. show how sleep is harmed by using iPads too much

67. What’s the main idea of the text?

       A. People should limit the use of electronic devices.

       B. Using iPads before bed can cause a poor night’s sleep.

       C. Scientists are warning that blue light is bad for our health.

       D. Looking at screens of iPads increases chances of sleeplessness.

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60. HiFX Online covers the following services EXCEPT________.

       A. exchanging money                                    B. transferring money

       C. doing shopping online                                      D. transferring school fees

61. Which of the following statements are the reasons why people are advised to use HiFX Online?

① It offers highly competitive rates.

② It is fast but difficult to operate.

③ It is highly secure for customers.

④ It offers many payment methods.

A. ①②③                   B. ②③④                    C. ①②④                    D. ①③④

62. The underlined word “uptight” in the last paragraph has the closest meaning to ______.

       A. disappointed           B. tense                      C. frightened        D. excited

63. What is the author’s purpose of writing this passage?

       A. To advertise for a special company.

       B. To introduce an exchange service briefly.

       C. To guide people how to transfer their money.

       D. To make an advertisement for HiFX Online.

A British scientist whose schoolmasters told him he was too stupid to study science has been awarded the Nobel Prize in medicine for his pioneering work on cloning.

At the age of 15, John Gurdon ranked last out of the 250 boys in his school at biology, and was in the bottom set in every other science subject. Sixty-four years later he has been recognized as one of the finest minds of his generation after being awarded the ￡750,000 prizes, which he shares with Japanese stem cell (干细胞)researcher Shinya Yamanaka.

John revealed that his school report, which noted that for him to study science at University would be a waste of time, still sits on his desk at the Gurdon Institute in Cambridge. After receiving the report he switched his attention to classics and was offered a place to study at Christ Church, Oxford, but was allowed to switch courses and read zoology instead.

It was at Oxford as a postgraduate student that he published his research on genetics and proved for the first time that every cell in the body contains the same genes. He did so by taking a cell from an adult frog’s intestine (肠), removing its genes and putting them into an egg cell, which grew into a clone of the adult frog.

The idea was controversial at the time because it contradicted previous studies, and it was a decade before his work became widely accepted. But it later led directly to the cloning of Dolly the Sheep by Prof Ian Wilmut in 1996.

He received a call from the Swedish Academy telling him he had won the prize, but he was initially suspicious that the call was a trick by a friend or colleague speaking in a Swedish accent.

56. When John Gurdon was fifteen, he________.

       A. performed badly in science subjects.

       B. ranked last in every subject in his school

       C. showed great interest in working on cloning

       D. was not clever enough to go on with his study

57. According to the passage, the school report________.

       A. meant nothing to John Gurdon

       B. had a long-term effect on John Gurdon

       C. encouraged John Gurdon to work harder on science

       D. advised John Gurdon to study classics at Christ Church

58. How did John Gurdon prove that his idea is right?

       A. By reasoning.                                            B. By questioning.                           

C. By doing experiments                                 D. By quoting(引用) others’ research

59. When John Gurdon was informed of his winning the Nobel Prize, he felt________.

       A. excited                    B. calm                 C. relaxed                   D. doubtful

Today children always want to get anything they want at home, but they wouldn’t do housework. To teach my children a   36   , I decided to go on a cleaning strike for a(n)   37   , but I wouldn’t announce it.

   38   telling my girls, I did no picking up or cleaning those days. I still cooked and washed clothes, but things that they could   39   do themselves, such as tidying up after themselves, I wouldn’t do. Would a week be enough for Lois and Joe to notice their mess and   40   their tidy gene? I started   41   to see the result.

Day One of the strike passed as   42   . Lois and Joe left for   43   at 8 am, leaving behind bowls and dishes on the table. With great efforts, I ignored the   44   and headed out to work directly. Of course, the children’s bowls were still there when they came back from school. Where was their   45   point? I desired to clear the mess, but it didn’t seem to   46   them. In fact, I didn’t think they even noticed.

Day Two and Three followed the   47   pattern, and both the coffee table and the kitchen worktop were filled with some pretty dirty dishes. I   48   whether I had the staying power to see this through. By Day Four, however, I saw some signs of   49   and they developed a taste for order. When I opened the door, I was   50   to see everything in the kitchen was where it should be. After four days, my children were so sick of the mess, so they cleaned up themselves. Since then, they have kept the   51   of helping me with the housework. They   52   to wash the bowls while I tidied the room.   53   , every day they put their bedrooms in order.

I thought my experiment was   54   . As long as parents had   55   with children, they could learn many things from everyday life.

 The parents are making some changes to their previous education methods, of ________ negative effects they begin to be aware.

       A. who                         B. whom               C. whose                     D. which

 Never before ________planted so many trees and devoted so much to pollution treatment.

       A. had we                    B. we had                    C. have we                  D. we have

 He got a call from his mother, or he ________doing his assignment ten minutes ago.

       A. had finished                                               B. would have finished

       C. could finish                                                D. finished

 There must have been a large member of tourists in Beijing during the National Day holiday, ________?

       A. mustn’t there          B. haven’t there          C. didn’t there             D. weren’t there

 I just don’t understand ________that leads to so many teenagers becoming addicted to playing computer games.

       A. why it does             B. what it does            C. what it is                 D. why it is

 ________her mother after being separated for 20 years, she couldn’t help, even though she tried not to, ________.

       A. Seen; crying           B. To see; cry             C. Seeing; crying        D. Having seen; cry