【单选题】Thirty years ago, most teenagers had bicycles, but now they are comparatively rare. 【B1】 , motor scooters (小型摩托车) are much more common, 【B2】 , this may seem a sign of progress but 【B3】 the change is n...
【单选题】Thirty years ago, most teenagers had bicycles, but now they are comparatively rare. 【C1】______ , motor scooters(小型摩托车)are much more common. 【C2】______ , this may seem to be a sign of progress but 【C3】...