人工合成的吗啡衍生物_________________为非成瘾性中枢性镇咳药,过抑制延髓咳嗽而发挥中枢性镇咳作用

A．错误
B．正确

we know the feeling of dying person, ________how to show love to others B．how to shownger to others C．yet we know were wrong D．in vrious kinds of sports E．but were often wrong F．for old people to depend on othersA．how to show love to othersB．how to show anger to othersC．yet we know we are wrongD．in various kinds of sportsE．but we are often wrongF．for old people to depend on others