第20题: [单项选择]It is virtually impossible to______the number of people in the world who have acquired an adequate working knowledge of English in addition to their own languages. A. appraise B. evaluate C. assess D. estimate 参考答案:D 答案解析:estimate意思是form a judgment或calculate“估计”;assess“估价”;appraise“评价”; evaluate“决定……的价值”。句意为:“实际上不可能估计出世界
参考答案:It is unlikely that environmental changes will extinguish the entire human race,but it is difficult to maintain/sustain the existing civilization.
第33题: [单项选择]Dever将影响健康的因素分为四大类,下列哪一项不在这四大类之列 A. 生物学因素 B. 环境因素 C. 生态因素 D. 生活方式 E. 卫生服务 参考答案:C 答案解析:健康教育、社会医学等教材中多次提到影响健康的四大因素是:生物学因素、环境因素、生活方式和卫生服务。因此可以判断出A、B、D、E都属于上述四类因素,而“生态因素”(C)不在四类之列。