问题
单项选择题
经测定，一生物样品的含氮量为10g/L，那么，蛋白质的浓度是多少
A．67.5g/L
B．62.5g/L
C．57.5g/L
D．52.5g/L
E．72.5g/L
答案
参考答案：B
解析：[解题思路] 因蛋白质含氮量平均为16%，测得含氮量即可计算蛋白质的浓度。1g氮相当于6.25g蛋白质。
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经测定，一生物样品的含氮量为10g/L，那么，蛋白质的浓度是多少
A．67.5g/L
B．62.5g/L
C．57.5g/L
D．52.5g/L
E．72.5g/L
参考答案：B
解析：[解题思路] 因蛋白质含氮量平均为16%，测得含氮量即可计算蛋白质的浓度。1g氮相当于6.25g蛋白质。
用所给词的适当形式完成下列短文 Christmas was coming. A lot of 1 were going to town. They hoped to 2 some vegetables, fruit and meat in the market. And then they were going to buy some 3 for their families. A bus came. They tried to 4 . Robert, a strong young man, rushed in first. He occupied(占)two 5 : one for his girl friend Mable and the other for himself. The bus started. Robert had a look 6 the bus. He saw a lot of people 7 there. There were some old men among them. He hurried to 8 his eyes. Mable found it and thought he felt 9 and asked, “What’s wrong with you, dear?”“ 10 ,”answered the kind-hearted (好心肠) young man. “I can’t bear (忍心) to see the poor old men!”
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