第6题: [单项选择]What are they talking about A. He is happy. B. He is surprised. C. He is not happy. 参考答案:C 答案解析:[听力原文] M: Yesterday the letter arrived. W: But it’s too late.
第13题: [单项选择]Under normal conditions, the main source of crankcase oil contamination is attributed to () A. metal particles loosened by wear B. air when air cleaners are not used C. condensation of water vapors D. breakdown of the lubricating oil by dilution 参考答案:D
第14题: [单项选择]Would you bring me some up-to-date catalogues
A. current B. well-documented C. lavish D. hostile 参考答案:A