The bicycle neither gives enough protection from the weather nor is very suitable for carrying goods, and demands considerable muscular work to make progress against wind or uphill. It also offers its rider no protection against collisions (碰撞) with other vehicles. All these difficulties could, however, be greatly got rid of with relatively small changes in design. The whole machine could be enclosed in a plastic bubble (气泡) which would provide some protection in case of accidents.It would be easy to add a small petrol or electric motor. A wide variety of designs would be possible. As in rowing, we might employ the power of the arms or the general body musculature, as well as those of the legs; more muscular exercise would be good for the health of many people in cities, and a wide use of bicycle like muscle-powered vehicles would be a useful way to ensure this. It could also provide opportunities for showing-off by the young and vigorous.

　　17. The main idea of the first paragraph is that the car _______.

　　A. can satisfy the demand for speed B. causes waste of space C. produces disturbance to other road users D. is far from perfect for short range movements

　　18. More attention should be given to the bicycle as a means of transport because it is _______.

　　A. a very efficient and simple device

　　B. much cheaper than a car C. widely used in Amsterdam and Cambridge

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