【单选题】it is generally thought that as teachers work with students, psychology course work is ______ to teacher-training.
【单选题】The international students in the US work harder than the American students.
【单选题】( )是指由车载电源提供全部或部分动力,用电机驱动车轮行驶,符合道路交通、安全法规等各项要求的汽车。