题目内容：
阅读下列短文，回答题。A Trip to the Forest
One day Bob took two of his friends into the mountains. They put up their tents (帐篷) and then rode off into a forest to look at the trees.
In the afternoon when they were about ten kilometres from their camp(营地) ,it started to snow.
More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp,and the other went to his house. But everywhere was just was white snow and everything looked the same. How could he get his friends back to the camp?
Bob had an idea. The horses! Let the horses take them back! But what would happen if the horses took the road to his house? That would be a trip of thirty-five kilometres in such cold weather!
It was getting late. They rode on and on. At last the horses stopped. Where were they? None of them could tell. Bob looked around. What was that under the tree? It was one of their tents!
Bob and his two friends went to the forest to__________. A．build their camp
B．find their way home
C．enjoy the mountains in the snow
D．look at the trees in the forest
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