问题
单项选择题 A1型题
维系蛋白质分子中α-螺旋结构的主要化学键是（）
A.肽键
B.氢键
C.盐键
D.疏水键
E.二硫键
答案
参考答案：B
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维系蛋白质分子中α-螺旋结构的主要化学键是（）
A.肽键
B.氢键
C.盐键
D.疏水键
E.二硫键
参考答案：B
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| In a land far away, once upon a time there was great poverty (贫困), and only the rich could manage without great 1 . Three of those rich men and their servants were 2 together on a road when they came to a very 3 village. The first could not stand seeing the poverty, 4 he took all the gold and jewels from his wagons (四 轮载重马车) and shared 5 out among the villagers. He wished them all the best of luck, and he left. The second rich man, seeing the 6 situation, stopped for a short time and gave 7 all his food and drink, since he 8 see that money would be of little 9 to them. He made sure that they each 10 their fair share and would have enough food to 11 for some time. Then, he left. The third rich man, on seeing such poverty, 12 and went straight through the 13 without stopping. The two other rich men saw this from a distance and commented with each other 14 the third rich man lacked sympathy. It was 15 that they themselves had been there to offer help. However, three days later, they 16 the third rich man,who was coming in the opposite direction. He was 17 travelling quickly, but his wagons, 18 the gold and valuables they had been 19 , were now full of farming tools and bags of 20 . He was rushing back to help them out of poverty. | ||||
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