第23题: [单项选择]An advantage of aluminum pistons, when compared to cast iron pistons is (). A. greater high temperature strength B. better heat conductivity C. greater weight per cubic inch D. increased resistance to wear 参考答案:B
A. reserved for B. engaged in C. used up D. taken up 参考答案:D 答案解析:短语动词辨析题。take up意为“占去(时间、地方、注意力等)”。reserve for意为“为…留出,保留”;engage in意为“从事;参加”;use up意为“用完,用光;耗尽”