People used to think that______.
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1 .Which of the followings would be the best summary of the passage?
A cancer and environment B the fear caused by cancers C data on cancer incidents D cancer and its investigations.
2 .Which of the following is implied in the sixth paragraph?
A Marriages in the US today are quite unstable. B More and more people in the US today want to get married. C Living longer would make it easier for people to maintain their marital ties. D If people live longer，they would stay in marriage longer.
3 .All of the following are possible effects living longer might have on working life EXCEPT______.
A Communication between employers and employees would be more difficult. B More money would be used by employees in payment of their employees. C The job market would be more competitive. D It would be more difficult for young people to be promoted to top positions.
4 .An important feature of a society in which people live a long life is that______.
A it places more emphasis on educating the young. B it is both wise and energetic. C it lacks the curiosity to experiment what is new. D it welcomes changes.
5 .Which of the following best describes Callahan 's attitude to anti-ageing technology?
A Optimistic. B Pessimistic. C Reserved. D Negative.
7 .Which of the following statements is true according to the third paragraph?
A More and more children in developing country begin to use cellphone B Cellphone usage causes more brain tumors among children C The risk of cellphones causing brain tumors in children can be excluded D Outer brain tissue of adult cannot absorb cellphone energy
8 .Major health problems_______.
A are related to cellphone usage B have certain relationship with cellphone usage in adult C caused by cellphone needn’t to worry about D have little relationship with cellphone use in adults
9 .Which statement is the opinion of WHO?
A Cellphone relates to brain tumors B Cellphone is possible to cause cancer in humans C Cellphone emissions directly damage DNA D People still need to worry about the risk caused by cellhone.
10 .Which is the final conclusion of the researchers?
A Several confounding factors could not be ruled out B There are no obvious differences between regular users and non-users C A large risk of cellphone causing brain tumors in children can be excluded D Cellphone cannot increase the risk of brain tumors.
