单选题
The new bicycle exhibited at the National British Cycling Championships was radical because ______.
A、
it was made from the gold medal-winning design of the Barcelona Olympics
B、
it was the first commercial mountain bike
C、
its public showing last weekend aroused many people's curiosity
D、
it was made of one single piece of carbon fibre
【正确答案】
D
【答案解析】
根据原文第一段最后一句，根本的变化是由于制作材料的变化所引起的。
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