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【单选题】请根据下面短文回答下列题： Safety Rules for Bike-Riding. 1. Never ride out into a street without stopping first. 2. Watch for stop signs. 3. Look behind before turning or changing lanes (车道) . 4. Always ride on th...
A.
[A] Before they ride out into a street.
B.
Before they see stop signs.
C.
Before they make turns.
【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...
A.
At the other end
B.
On the contrary
C.
On the other hand
D.
In addition