2. 外语
  3. Brushing and flossing can surely keep your teeth and gums healthy. Contaminated toothbrushes have been already shown to transmi

Brushing and flossing can surely keep your teeth and gums healthy. Contaminated toothbrushes have been already shown to transmi

admin2009-04-23  37
问题 Brushing and flossing can surely keep your teeth and gums healthy.
Contaminated toothbrushes have been already shown to transmit viruses and bacteria.
选项 A、Y
B、N
C、NG
答案C
解析 定位到文章标题Tips on Proper Brushing下的第五条建议：The exchange of body fluids that such sharing would foster places toothbrush sharers at an increased risk for infections，a particularly important consideration for persons with compromised immune systems or infectious diseases．(交换牙刷过程中产生的液体交换会增加牙刷交换者的感染风险，这一点对于那些有免疫系统疾病或传染病的人来说更需注意。)由此可见，文章中没有提到被污染的牙刷会否传播病毒和细菌。
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大学英语六级

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