问答题 如果出口座位旅客不愿意在紧急情况下帮助其他旅客撤离，乘务员应该怎样处理？
未知题型 What can we infer from the saying' There's no one thing you can do'(ParA.2 )?A.People can do nothing about silencing the noise of airplanes.B.There are toe many things to be considered when people make planed quiet.C.People have to deal with everything that causes the noise of airplanes.D.Only one thing needs to be done when people silence the noise of airplanes.
单项选择题 Python标准库os.path中的函数isfile()可以用来测试给定的路径是否为文件。 A、正确 B、错误