题目

—How about a chat over a cup of coffee this afternoon? —Sorry, I'm today and can't put you in. Let's make it sometime next week. A . on a limited budget B . in high spirits C . on a tight schedule D . in deep doubt 答案：C将棱长分别为acm和bcm的两个正方体铝块熔化，制成一个大正方体铝块，这个大正方体的棱长为 cm．（不计损耗）．