问题
选择题
下列各组物质的区分方法中，不可行的是 [ ]
A．硬水、软水--加肥皂水，搅拌观察泡沫的多少
B．羊毛纤维、涤纶--灼烧，闻气味
C．氮气、二氧化碳--用燃着的木条检验，观察燃烧的现象
D．氯化钾、氯化铵--加熟石灰，研磨，闻气味
答案
答案：C
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下列各组物质的区分方法中，不可行的是 [ ]
A．硬水、软水--加肥皂水，搅拌观察泡沫的多少
B．羊毛纤维、涤纶--灼烧，闻气味
C．氮气、二氧化碳--用燃着的木条检验，观察燃烧的现象
D．氯化钾、氯化铵--加熟石灰，研磨，闻气味
答案：C
It was late in the afternoon. Several hundred villagers left their houses and gathered in the open air outside the village. They were staring __ __ at the mountain top in the distance. It was covered with __ __ —beautiful and dangerous. The huge mountain is called Matterhorn. Mountain climbers had __ __ the top, using the southern route. But no one had __ __ dared to try a winter climbing up the northern side. But now one man was daring to try the __ __ route— the northern route, which was more difficult. He was Walter Bonatti, a great mountain climber from Italy. For two days he had climbed. The village people had watched him __ __. Now they were waiting to see his ____. If he planned to __ __ the next day, he would light a green signal. A red light would mean that he was __ __. A tiny green light __ __ high on the mountain side. Bonatti was not giving up! The people __ __. The next day he continued his way upward. He was so lonely and so __ __！But he would not give up. Again that night he lit the __ __ light. In the morning, Bonatti __ __. He could not see the top, but he knew he was __ __ there. Though the climb was painful, he moved up. Bonatti had spent months __ __ for the climb. Was the training enough? Did he have the strength and ____ to climb to the top? He was finally at the top! News about his __ __ was radioed to the world. The trip __ __ the southern route was easy. He was warmly welcomed in the village. He had done the “ __ __ ”，and would be well remembered as a climber of all time.
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