烷烃含量超过25%-30%的石油称为烷基（石蜡基）石油（）。
参考答案：对
– Were you late for work yesterday morning?
– Yes. By the time I got to the bus stop, the early bus .
A. has already left B. is already left C. had already left
《水浒传》中阮氏三雄本来都是梁山泊附近（）
