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Playing video games can be a fun way to unwind or spend time with friends. In schools, teachers use games like Minecraft to encourage teamwork and critical thinking.(77) But for some players, gaming has become an unhealthy habit. Late at night, they are glued to a screen. Schoolwork suffers. The video-game world seems a friendlier place than the real one.Mental health experts have taken notice. In June, the World Health Organization (WHO) added gaming disorder to its list of diseases and health conditions. A person may have the disorder if gaming has damaged his or her relationships with family and friends, and if it has affected his or her daily activities.Not all experts agree that excessive gaming should be called a disorder. They say people hooked on video games may be suffering from other mental health problems that should be treated first.Others think WHO made the right call. Psychiatrist (精神科医生) Clifford Sussman treats gaming addiction (上瘾). (78) He says kids often have feelings of anxiety and loneliness. They get angry when a parent asks them to stop playing video games.What makes video games addictive? Playing excites the brain’s reward center. After a while, the brain becomes numb (麻木的) to pleasure. You feel bored without a controller in your hand. So you play even more.One key to healthy gaming is to track how long you play. Sussman recommends taking at least an hour-long break after every hour of play. That gives the brain time to recover.Young gamers who think they might have a problem should seek help from an adult. Sussman suggests you first answer a single question: “Are you in control, or is the game in control?”1. Which of the following is the best title for the passage?2. The word unwind in Paragraph 1 is closest in meaning to(  ) .3. Clifford Sussman’s attitude to WHO’s recognition of excessive gaming as a disorder is(  ) .4. Sussman advises game players to(  ) .5. According to the passage, which of the following statements is NOT TRUE?

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Since the beginning of history, man has been attracted by the idea of living forever, of winning the fight against death and disease. So far, this has only remained a dream, though a very powerful one. Many people have wondered whether it would be possible to find a way to preserve human bodies, and what would be the best way to preserve human bodies.It has long been known that meat of fruit can be kept fresh for long periods by freezing; in ancient China, for example, food was stored with ice to keep it fresh. This method could also be useful for preserving humans, and in fact many people have explored this possibility.However, most living beings that exist under warm conditions die when frozen. This is because of the harmful effects of freezing ice crystals (晶体),which are not only larger than the volume of the water originally in the cells, but also form sharp cutting shapes that harms the cells.In the 1940s Dr B. J. Luyet and a group of scientists in England were working on the problem of freezing cells without damaging them. Since the harm caused by ice crystals was the main cause of the damage, Luyet suggested removing some or all of the water from the cells before freezing them.Using living cells from chicken, Luyet and his assistants discovered that they could partly dry the chicken cells, using a mixture of the white part of an egg and glycerin(丙三醇),a clear, thick liquid made chiefly from fats and oils. Some success was obtained. The chicken cells were dried, frozen for a period of time, and then carefully unfrozen. Almost all the cells recovered when they reached normal temperatures.Since then, the cooling of whole animals to a temperature very much below freezing point forlater unfreezing has become more of a possibility, and the glycerin method would probably be used to accomplish this. When this can be done completely and successfully, science will have moved much closer to its aim of freezing and storing incurable patients until the day they can be cured.1. The passage is mainly about( ).2. The idea of freezing human bodies to preserve them( ).3. According to the passage, freezing is( ).4. Glycerin can be used( ).5. The success obtained by Dr Luyet and his helpers was a long step towards ( ).

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Throughout history, humans have suffered from a condition that they have never been able to escape — ageing. Some researchers, however, believe we may be thinking about it in the wrong way. They say we should start treating ageing itself as a disease — one that can be prevented and treated.Their hopes are founded on recent discoveries that suggest biological ageing may be entirely preventable and treatable. From a biological preventive, the body ages at different rates according to genetic and environmental factors. Tiny errors build up in our DNA and our cells begin developing faults that can grow into tissue damage, which leads to ageing and ageing-related diseases.One of the leading figures in human life research, Aubrey De Grey, explains in an interview that their goal is to develop a set of therapies for middle-aged and older people that will leave them physically and mentally equivalent(相当的)to someone under the age of 30. “Of course, without wiping their memories,” he adds. But he doesn’t think that will be possible to stop ageing altogether. He sees a future where “rejuvenation technologies” can be applied to old people in order to revert their cells to what they were like when they were in their youth, buying them extra time. The idea is that someone who is treated at the age of 60 will be biologically reverted to 30. But because the therapies are not permanent fixes. Their cells will end up becoming 60 years old again in another 30 years time.1. By “treating ageing itself as a disease”, some researchers mean( ) .2. Humans age at different rates due to( ) reasons.3. The goal of De Grey’s research is to ( ) .4. What does “rejuvenation”(Para. 3) possibly mean?5. What will happen if someone is treated with De Grey’s technology?

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Over the years, college students have stood together for what they believe in, from civil rights to anti-war policies to the more recent protests against the unequal distribution of wealth. But nowhere in history have students banned(禁止)bottled water. Until now.The bottled water ban, which started on just a few campuses, has now spread nationwide to more than 20 universities. The colleges have either completely banned the use of plastic bottles altogether, or some have taken a more limited approach with partial bans.Many people believe that producing and using bottled water wastes money and harms the environment. They say that bottled water is unnecessary because public water supplies in the U. S. are among the best in the world. Water fountains and reusable bottles with easy access(获取)to filling stations are a better choice.An organization called Ban the Bottle raises awareness about the economic and environmental costs of using plastic bottles. The group claims that eight glasses of water a day costs each person 49 cents annually, while drinking from plastic containers costs $ 1,400 per year. Plastic bottles contain antimony—a chemical that in low doses causes depression, but in large doses can even lead to death.The controversy over bottled or tap is not limited to the students and college administrations. The make of bottled water see the movement as a threat. They argue that plastic bottles make up a small portion of the nation’s total waste. It's unfair to single out(单独挑出)their product when so many other items are packaged in plastic containers. Plus, water is a healthy choice compared to some sodas and juices that are also sold at school.1. Which of the following is the main idea of the passage?2. According to Ban the Bottle, drinking bottled water costs dollars per year.3. The word controversy in Paragraph 5 is closest in meaning to. 4. What does the bottled water industry use in its own defense?5. According to the passage, which of the following statements is TRUE?

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