Mobile phones should carry a label if they proved to be a dangerous source of radiation, according to Robert Bell, a scientist. And no more mobile phone transmitter towers（发射塔） should be built until the long-term health effects of the radiation they emit（放射） is scientifically evaluated, he said. "Nobody’s going to drop dead overnight but we should be asking for more scientific information," Robert Bell said at a conference on the health effects of low-level radiation. "If mobile phones are found to be dangerous, they should carry a warning label until proper shields can be devised," he said.According to Robert Bell, if mobile phones prove to be dangerous to people's health
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1 .原文："Scientific conservatism suggests that a biological explanation should be the last choice after all non-biological explanations are addressed," Allen said. "We have a lot of work to do to rule out (排除……的可能性) possible non-biological explanations. It is more likely that a chemical process, without biology, can explain these results."What can be inferred from what Allen said?
A Scientists have different arguments over whether there is life on Titan. B Scientists all agree that there is life on Titan. C Scientists all suggest that a biological explanation is reasonable. D Scientists all agree that a non-biological chemical reaction is a possible explanation.
2 .原文：Somewhere around puberty (发育；青春期), something happens in the timing of the biological clock. (2)The clock pushes forward, so adolescents and teenagers are unable to fall asleep as early as they used to. When your mother tells you it's time for bed, your body may be pushing you to stay up for several hours more. And the light coming from your computer screen or TV could be pushing you to stay up even later.What is implied in the second paragraph?
A Young children's biological clock has the same rhythm with that of the teenagers. B People after puberty begin to go to bed earlier due to the change of the biological clock. C Children before puberty tend to fall asleep earlier at night than adolescents. D Teenagers go to bed later than they used...
3 .原文：On a September day in 1991, two Germans were climbing the mountains between Austria and Italy．High up on a mountain pass，they found the body of a man lying on the ice. At that height(10,499 feet，or 3,200 meters)，the ice is usually permanent，but 1991 had been an especially warm year．The mountain ice had melted more than usual and so the body had come to the surface．It was lying face downward. The skeleton(骨架)was in perfect condition, except for a wound in the head. There was still skin on the bones and the remains of some clothes．The hands were still holding the wooden handle of an ax and on the feet there were very simple leather and cloth boots． Nearby was a pair of gloves made of tree bark(树皮)and a holder for arrows．What can be inferred from paragraph 2?
A The Iceman lived a poor life． B The Iceman could have died from the wound in the head． C The Iceman was struck dead from behind． D The Iceman was killed while working.
4 .We are so used to our life on the surface of the earth that it can be quite an effort for our mind to break free of all the ideas that we take for granted. Because we can feel that things are heavy, we think of "weight" as being a fixed quality in an object, but it is not really fixed at all. If you could take a one-pound packet of butter 4, 000 miles out from the earth, it would weigh only a quarter of a pound.We find it hard to break free from ideas connected with living on the earth because
A it demands too great an effort for us to do so. B we are too familiar with the way things are to question the ideas. C we have proved that those ideas are correct. D we are so sure of ourselves that we never doubt anything on the earth.
6 .As well, there are 2,000 transmitter towers around Australia, many in high density（密度） residential areas. For example, Telstra, Optus and Vodaphone build their towers where it is geographically suitable to them and disregard the need of the community. The radiation emitted from these towers may have already produced some harmful effects on the health of the residents nearby.Many transmitter towers were built
A on high mountains. B in places suitable to the phone users. C in areas which can take in radiation. D in densely populated areas.
7 .The value of childhood is easily blurred（变得模糊不清） in today's world. Consider some recent developments: The child-murderers in the Jonesboro, Ark. schoolyard shooting case were convicted and sentenced. Two boys, 7 and 8, were charged in the murder of an 11-year-old girl in Chicago.The two boys in Chicago were
A shot. B murdered. C accused. D sentenced.
8 .Redemption （拯救） is a practical necessity. How can value be restored to young lives distorted （扭曲） by acts of violence? The boys in Jonesboro and in Chicago will be confined in institutions for a relatively short time. Despite horror at what was done, children cannot be —— dealt with as adults, not if a people wants to consider itself civilized. That's why politicians' cries for adult treatment of youthful criminals ultimately miss the point.According to politicians, when children commit crimes, they should be treated in the same way as
A murderers. B criminals. C victims. D adults.
