Jack came to Mr. Smith with a book in his hand. "I meant to take good care of your book, Mr. Smith," said the boy, "but I’ve damaged(损坏) it, and now I want to make it right with you. What shall I do to make up for it" "Why, what happened to it, Jack" asked the farmer, as he took the book which he had lent Jack. "It looks as if it had been out through all last night’s rain. How come you forgot, and left it out" "This is what happened, Mr. Smith," answered Jack. "I sat up late to read it, and when I went to bed, I put it away carefully in a little opening between two logs(原木) in the wall of our cabin(小木屋). When I woke up I took it out. You can’t imagine how I felt when I saw it. I’m sorry, Mr. Smith, and I want to make up for it, if you can tell me how, for I have not got any money to pay for it. " "Well," said Mr. Smith, "come and work on my farm three days, and the book is yours."
A.RightB.WrongC.Doesn’ t Say
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下列关于背部化诱导的描述错误的是 A.精子诱导细胞质成分重排 B.胚孔背唇富含神经化诱导子 C.诱导信息引起趋向移动 D.中胚层朝前获得形成头部肌的能力 E.中胚层朝后获得形成心的能力
A.精子诱导细胞质成分重排B.胚孔背唇富含神经化诱导子C.诱导信息引起趋向移动D.中胚层朝前获得形成头部肌的能力
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