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1 .People used to think that______.
A children and adolescents are sensitive to phone emissions B cellular-phone use cannot cause brain tumors C children and adolescents shouldn’t use cellular-phone in school D cellphone emissions can penetrate deeper into children brains
2 .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
3 .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
4 .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.
5 .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.
7 .__________
A ages B years C lives D countries
