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!"

亚洲的大河多发源于中部，呈放射状流向周边的海洋，说明亚洲的地势特征是（　　）