阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
As darkness fell, hundreds of people in the Swiss village left their houses. They were staring 36 at the mountain top in the distance. It was covered with 37 , beautiful and dangerous.
The huge mountain is called Matterhorn. Mountain climbers had 38 the top, using the southern route. But no one had ever dared to try a winter climbing up the 39 side. But now one man was daring to try the 40 route. He was Walter Bonatti, a great mountain climber from Italy.
For two days he had climbed. The village people had watched him 41 . Now they were waiting to see his 42 . If he planned to 43 the next day, he would light a green signal. A red light would mean that he was 44 .
A tiny green light 45 high on the mountain side. Bonatti was not giving up! The people 46 .
The next day he 47 his way upward. He was so lonely and so tired! But he would not give up. Again that night he lit the 48 light.
