先通读下面的短文，掌握其大意，然后从各题所给的A、B、C、D四个选项中选出一个最佳答案。

A

    It was very cold that day. It was 1 heavily and the ground was all white. So the shepherd(牧羊人) decided 2 in the warm room He put some hay(干草)  in the pen(围栏) 3  the sheep. The dog lay on the soft hay and soon fell 4.

    The sheep wanted to eat the hay. But every time they started, the dog would bark loudly to stop them. Then they had to run away  5.

    "What a selfish(自私的) dog!" The sheep began to talk angrily. "He cannot eat the hay, but stop those who can from eating!"