第21题: [单项选择]The latest {{U}}census{{/U}} is encouraging. A. count B. statement C. agreement D. estimate 参考答案:A 答案解析:census指的是an official count of the people who live in a country,including information about their age
第22题: [单项选择]粉尘对人体可产生以下哪种作用 A. 致纤维化 B. 刺激 C. 中毒 D. 致敏 E. 以上全部 参考答案:E