完形填空。阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。
Behind our house is the start of a fascinating trail (小径). This trail is one of the old roads that wind through untold miles of forest. My 1 , Beans, and I walk the trail frequently. Normally, Beans sniffs alongside the 2 to follow the smell of a deer track or 3 some cause known only to him.
Beans is a white dog, quite handsome and very 4 . He not only understands what
we tell him, but also often makes sounds as if he were trying to 5 back.
One morning, we took a different route, which led us to a(n) 6 trail. I was sure this trail would eventually lead us to our familiar 7 . But, no. We seemed to be far off course. After two hours, I suddenly realized that Beans probably 8 the way home. So I urged, "Beans, take me home." He ran down a new trail. But it merely led to an intersection (岔道口) of trails.
Soon it became 9 that we were getting nowhere. I began to picture the rest of the day in the 10 , without food or drink. We had walked about ten miles. But Beans seemed totally 11 . The sniffing and exploring was going well for him.
