第17题: [简答题]Environmental scientists are concerned that if industrial pollution was to continue without effective measures, the Earth's surface would warm up to a dangerous degree in the next few centuries.需要修改的单词是哪个?修改为什么? 参考答案:
was→were
第18题: [单项选择]哪项不是婴幼儿腹泻的易感因素() A. 消化系统发育不成熟 B. 消化道负担重 C. 肠道内感染 D. 血中免疫球蛋白及胃肠道分泌型IgA低 E. 胃内酸度底 参考答案:C