题目

Benjamin Franklin was a great scientist .He was the youngest of the  46   boys in his family . He was a clever boy,   47  cleverer than his nine brothers . He studied in school for only three years . He    48  to learn new things .He  49  worked on new ideas even when he was a child . There are a lot of stories about him and here’s one of them.One day in winter Benjamin Franklin learned from one of his   50    that something black in colour holds heat    51   than something white in colour “ Is that true ?” he asked himself . He wanted to know the answer.It h—Really? Who will give _________ lecture? — Mr. Wang, ________ professor from Nanjing University.A．the; 不填B．a; theC．the; aD．a; a