第14题: [单项选择]He’s working hard for fear that he ______. A. should fall behind B. fell behind C. may fall behind D. would fallen behind 参考答案:A 答案解析:[解析] for fear that后面的状语从句用sb.should do的形式。
第21题: [单项选择]梅毒: A. 经血传播 B. 经呼吸道传播 C. 经消化道传播 D. 经性传播 E. 经皮肤感染 参考答案:D
第22题: [单项选择]苯扎溴铵用于皮肤表面消毒的常用浓度是()。 A. 0.01%~0.05% B. 0.05%~0.1% C. 1%~5% D. 10% E. 2% 参考答案:B 答案解析:苯扎溴铵是新洁尔灭的化学名,为一种季铵盐阳离子表面活性广谱杀菌剂,杀菌力强,0.1%以下浓度,对皮肤和组织无刺激性,对金属、橡胶制品无腐蚀作用。
第33题: [单项选择]What is scientists' attitude towards the future of Chad Lake A. Pessimism. B. Hopeful. C. Indifferent. D. Doubtful. 参考答案:A 答案解析:[试题分析] 态度判断题
[详细解答] 关键语句:"Scientists say the problem is expected to worsen in the coming years as t