题目

Mr. Grey was the manager of a small office in London. He lived in the country, and came to work by train. He liked walking from the station to his office if it was not raining, because it gave him some exercises. One morning he was walking along the street when a stranger stopped him and said to him, “ You may not remember me, sir, but seven years ago I came to London without any money in my pocket . I stopped you in this street and asked you to lend me some money, and you lent me five pounds(英镑) , because you said that you were happy to take a chance so as to give a man a start o萌发的种子，细胞内代谢活动旺盛；干燥的种子，细胞内代谢活动缓慢。这说明A.水是细胞内代谢活动的产物B.水是细胞内代谢活动的必要条件C.水是细胞内的主要成分D.以上三项都正确