9. Anyone in the lab has to the following dos and don'ts.
科目:高中英语 来源: 题型:
9. We need to prevent pollution driving cars less and developing renewable energy.
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[答案] 3. [原文] Brain cancer is a concern that Ms Davis examines. Over all,there has not been an increase in its incidence since cellphones arrived. But the average marks an increase in brain cancer in the 20-to-29 age group and a drop for the older population.
[问题]According to Ms Davis,brain cancer increases
A. among children
B. among old people
C. in the twenties
D. among pregnant women
[答案]
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