题目

—I can hardly hear the radio. Would you please ______.   —Yes, of course.A．turn it onB．turn it downC．turn it offD．turn it up 答案：D解析:略下列选项中，不是鸟类适于飞行特征的是                         (   )A．身体呈流线型，体表被覆羽毛B．前肢特化为翼C．有膀胱，可储存尿液D．食量大，消化快