问题
多项选择题
煤炭开采加工及利用过程中产生的废物已被利用的有（）。
A.煤矸石
B.粉煤灰
C.脱硫石膏
D.氮化合物
答案
参考答案：A, B, C
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煤炭开采加工及利用过程中产生的废物已被利用的有（）。
A.煤矸石
B.粉煤灰
C.脱硫石膏
D.氮化合物
参考答案：A, B, C
Rudi Matt lived in a small village in the Swiss Alps in 1865. What he wanted most in the world was to climb 31 highest peak (山峰) in the Alps. 32 mother and his uncle, Franz, a mountain guide, wanted him to stop 33 and start working in a hotel. Rudi would not 34 his dream and secretly got in touch with an English mountain climber 35 was planning to climb the highest peak. Franz was very angry when he found out 36 Rudi had done, but he finally agreed to let Rudi go if he went climbing, too. Franz also didn’t want to see Emil Saxo, a guide from another village, got to the top 37 him. Rudi turned out to be a very good climber, 38 as they got close to the top, the Englishman got sick and couldn’t go on farther. Franz 39 behind to take care of him, but Saxo continued, wishing to be the 40 to the top. Rudi went after Saxo, hoping to 41 him to the top. When they met, Saxo fought with Rudi and fell down by accident. Saxo was 42 and hurt. Rudi must decide whether to carry Saxo back down to safety or to continue alone to the top. He thought Saxo’s life was more 43 than his dream and helped him down. During that time, the Englishman and Franz continued the climb, and finally 44 reached the top. Later, the villagers 45 knew Rudi was the real conqueror (征服者) of the mountain.
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