单选题
The reason why the rock was hard to get down was that_________.
A、
it had been worn smooth
B、
there was no grass on it
C、
it was wet and slippery
D、
it was soft and sandy
【正确答案】
A
【答案解析】
[解析]从文章第三段第三句：The water that rushed down all these small valleys in the rainy season had made the rock as glass．得知。故本题答案为A。
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