同等学力考试英语样卷三及答案解析Part Ill Reading Comprehension(45 minutes。25 points)Section A Directions: In this section ， there are four passages followed by questions or unfinished statements，each with four suggested answers A，B．C and D．Choose the best answer and mark your answer on the Answer Sheet．Passage One 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 LiveScience.(21)What makes the children’s common vaccines less effective according to the new study?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．(22)The Harvard School of Public Health experts found that there was______relation between concentrations of chemical deposits i...
