问题
选择题
某一对夫妇，先后生育了四胎，全部是女孩，下列有关原因的分析中，正确的一项是 [ ]
A．该妇女所产生的卵细胞，全部是含有两个X染色体的
B．该男子所产生的精子中，全部都是含X染色体的
C．该夫妇受精作用时，每次都是含X染色体的精子与卵细胞结合的
D．以上三种情况均有可能出现
答案
C
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某一对夫妇，先后生育了四胎，全部是女孩，下列有关原因的分析中，正确的一项是 [ ]
A．该妇女所产生的卵细胞，全部是含有两个X染色体的
B．该男子所产生的精子中，全部都是含X染色体的
C．该夫妇受精作用时，每次都是含X染色体的精子与卵细胞结合的
D．以上三种情况均有可能出现
C
There are lots of funny stories in my childhood .The first one that 16 my mind is the story of my first camera. It happened 20 years ago . Just when I was ready to go to school , my grandmother 17 me a new camera from the supermarket as a present . Even if my mother wasn’t too happy about what I had 18 , I asked my father if I could take my camera to my 19 so that I could take pictures with my classmates . He agreed and show me how it 20 . It was very easy. At school I showed it to all my 21 and we took a lot of pictures, 22 they were not too great . The photo with my friends was the worst as I didn’t took Tom’s head ; instead I 23 his sandwich . The boys were interested in my camera , 24 Daniel who said he had a 25 one with a flashlight . He explained to us that the flashlight helped to take pictures in the 26 but I accused(指责)him of being a liar . Like all boys we started fighting . 27 ,our teacher separated us .After explaining to him the reason of the fight , I 28 him not to take my camera away. When my parents knew what had happened , they weren’t glad . My mother punished me for being 29 . She took the camera in order to 30 further problems , telling me that for a boy like me the camera was not a good 31 to play with. To make her 32 about the fight , I took a picture with her and Dad with the film left . In a couple of days Dad 33 the films and brought the photos home , saying I wasn’t good at taking pictures at all . I got 34 and argued that we all learnt from our 35 .
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