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  3. Childhood exposure to a group of chemicals, which are used widely in a variety of products, including water-resistant clothing a

Childhood exposure to a group of chemicals, which are used widely in a variety of products, including water-resistant clothing a

admin2017-09-26  8
问题     Childhood exposure to a group of chemicals, which are used widely in a variety of products, including water-resistant clothing and microwave popcorn, could reduce the effectiveness of common vaccines, a new study has found.
    Researchers at the Harvard School of Public Health in Boston looked at over 580 children and found that those who had higher concentrations of these perfluorinated(全氟化的)compounds(PFCs)in their blood had lower immune responses to diphtheria(白喉)and tetanus(破伤风)vaccinations.
    An insufficient immune response to a vaccine can mean a child is actually vulnerable to catching a disease even though they have been vaccinated against it, the researchers said.
    " When we take our kids to the doctor’s office to get their shots, we expect that the vaccines are going to work. What we found was that there was an increasing risk that they didn’t work if the kids had been exposed to the PFCs," study author Philippe Grand-jean was quoted as saying by Live Science.
What makes the children’s common vaccines less effective according to the new study?
选项 A、The exposure of chemicals they used in childhood.
B、The reduction of a series of chemicals in childhood.
C、Childhood consumption of chemical products.
D、Childhood contact with chemical products.
答案D
解析 细节题。根据关键词the children’s common vaccines less effective定位于首段，儿童跟化学物品接触会降低常见疫苗的有效性。故选D。
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