第9题: [单项选择]Which of the following is NOT the result of laboratory experiments A. Low concentrations B. Fall in lung function C. Irritability of the lungs D. Air way inflammation 参考答案:A 答案解析:选择依据是原文第二段这样一句话:Even at quite low concentrations there is a reversible fall in lung function,an incr
第23题:[单选题]__________finishes eating lunch last ought to wash the dishes. A.The person B.Whoever C.Anyone D.Who 参考答案:B 考查主语从句。分析句子结构,该句缺少主语成分。当anyone等指人的不定代词作先行词时,后面要由关系代词who引导定语从句,即Anyone who finishes eating lunch last ought to wash the dishes。whoever引导主语从句,相当于the person who或anyone who,但只表示“谁”,句意为“最后吃完午饭的人要刷盘子”。 @jin