A. Two bikes.
B. Two riders.
C. Two places.
D. Two taxies.
解析：考查细节理解题。根据表格二句子I always go out by bike. Bicycle-sharing system allows people borrow a bike from point A and return it at point B.我总是骑自行车出去。共享单车允许人们从A处借，然后把它归还在B处。这里"A"和"B"指的是两个地方，故选C。
答案：C
《What do "A" and "B" refer to(指)in Yala's words? A. Two bikes. 》出自：百味书屋
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