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单选题
Which of these is untrue for the present bicycle?
A
It is far more efficient than the movement of animals.
B
It offers its rider no protection.
C
It is not very suitable for carrying goods.
D
It can hardly be improved on.
参考答案
参考解析
解析：
本题可参照文章的第三段。第三段介绍了如何通过改造来克服自行车的缺点，因此D项为正确答案。
本题可参照文章的第三段。第三段介绍了如何通过改造来克服自行车的缺点，因此D项为正确答案。
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