第18题: [单项选择]在原油的化学分类中,最常用的有()。 A. 特性因数分类 B. 相关系数分类 C. 结构族组成分类 D. 烃族组成分类 参考答案:A
第19题: [单项选择]A. People can enjoy the delicious seafood there. B. People can do some exciting sports such as diving. C. People can see the beautiful scenery and relax themselves. D. People can participate in activities like fishing, boating and swimming. 参考答案:B 答案解析:[听力原文] Which one is not the reason why people go to the coast