第16题: [单项选择]How many people are there in the man’s family A. There are four people in the man’s family. B. There are five people in the man’s family. C. There are six people in the man’s family. 参考答案:C 答案解析:[听力原文] W: How many people are there in your family M: I have my mother, father, one sister an
第17题:[单选题] 塑料焊接加热温度一般为( )。 A. 100~150℃ B.180~190℃ C.200~240℃ D.240~250℃ 参考答案:C