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【单选题】
Read the introduction [paragraphs 1-6]. How is bouldering different from lead climbing?
A.
In bouldering, people race up tall walls, and in lead climbing people have to be careful not to fall because they do not have ropes.
B.
In bouldering, people follow paths on low walls, and in lead climbing people see how high they can climb in six minutes.
C.
In bouldering, people use ropes to stay safe, and in lead climbing people climb sideways across a low wall.
D.
In bouldering, people climb indoors, and in lead climbing people climb outdoors as long as the weather is good.
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参考解析：
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