第20题: [单项选择]What did the woman’s son do A. He’s a reporter, B. He’s a salesman. C. He’s a repairman. D. He’s a mailman. 参考答案:D 答案解析:[听力原文] W: Hello, this is Betty Towery. May I speak with my son, please M: I’m sorry, he’s sti
第21题: [单项选择]塑限试验时土中有机质含量不大于()。 A. 2% B. 0.5% C. 0.25% D. 5% 参考答案:D 答案解析:参考GB/T50123-1999中土的液限试验时土中有机质含量不大于5%。