题目

29．为获得纯合高蔓抗病番茄植株，采用了下图所示的方法，图中两对相对性状独立遗传。据图分析，不正确的是（    ） A．图中筛选过程不改变抗病基因频率 B．过程②可以取任一植株的适宜花药作培养材料 C．过程③包括脱分化和再分化两个过程 D．过程①的自交代数越多，纯合高蔓抗病植株比例超高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, because you said that you were happy to take a chance so as to give a man a start on the road to success.” Mr. Grey thought for a few moments and then said, “ Yes, I remember you. Go on with your story.” “ Well,” answered the stranger, “Are you still ready to take a chance again?”【1】Mr. Grey walked to his office only when the weather was ________.A. well B. fine C. bad D. raining【2】Mr. Grey walked because _______.A. he was poorB. it was not rainingC. it helped him in good healthD. he had a lot of homework【3】Mr. Grey _______ the stranger some years before.A. had stopped B. had calledC. had heard of D. had helped【4】The stranger ______ since then.A. had been successful B. had still been poorC. had been rich D. had had much money【5】Now the stranger wanted to ______.A. ask for some money again B. give Mr. Grey his money backC. help Mr. GreyD. lend Mr. Grey some money