题目

鸟卵中的细胞核，位于卵黄结构中 （判断对错） 答案：【答案】正确【解析】卵黄位于细胞的中央，呈黄色，是胚胎发育的主要营养物质；胚盘，卵黄表面中央有小白点，里面含有细胞核。未受精的卵，胚盘色浅而小；已受精的卵，胚盘色浓而略大，这是因为胚胎发育已经开始。如果是受精卵，胚盘在适宜的条件下就能孵化出雏鸡。胚盘进行胚胎发育的部29、Dear Mum,     I don’t think you understand my life．You think I should be studying all the time．I know  you want me to find a good job when I grow up，but I would like to have a wonderful time．too．You never think about fun thing for me to do like music and sports．Two days ago，when I was watching a football game on TV，you asked me to stop and to do my homework．After finishing my homework，still I read my football magazines．You said I must go to bed early．That was bad enough，but yesterday was the worst day．I bought some computer games，and put them in my bag so that you couldn’t see them．I told you I would do my homework first．I knew it was wrong to lie(撒谎) to you，but you told me that Dad would talk to me later．Mum，I don’t like what you did to me！I really love you，Mum，but I wish you could try not to be so strict with me．                                                             Love，                                                             Zhang Ning 根据短文内容，选出最佳答案。 1．Zhang Ning’s mother wants him __________ when he grows up．     A．to be a teacher         B．to find a good job     C．to work in a big city    D．to become a football star 2．__________ is Zhang Ning’s favorite sport．     A．Football      B．Volleyball      C．Basketball    D．Baseball 3．Zhang Ning is asked __________．     A．to watch TV             B．to do sports     C．to play computer games    D．to study all the time 4．Zhang Ning put the computer games in the bag because __________． A．he didn’t like them    B．he played them many times     C．he wouldn’t like his mother to find them     D．there was something wrong with them 5．We know from the letter that __________．     A．ZhangNing lives a very happy life     B．Zhang Ning hates his mother     C．Zhang Ning wishes to study all the time     D．Zhang Ning’s mother is very strict with him