题目

如右图所示,卵原细胞内含有A与a、B与b两对同源染色体,已知此卵原细胞经减数分裂所形成的卵细胞的染色体组成为Ab,则同时所产生的3个极体的染色体组成分别为 A.AB Ab ab B.Aa Bb AB C.Ab aB aB D.AB aB ab 答案:C  请根据以下内容,以A famous ping-pong player为题写一篇不少于8o词的短文,介绍我国著名的乒乓球运动员——张怡宁。  Name.Zhang Yining        Date of birth:05/10/1982  Birth place:Beijing         Height:1.68m  1988:starts to play table tennis    1991:joins the Beijing table tennis team  1993:joins the national table tennis team 1998:becomes a ping-pong champion  2004:wins two gold medals at the 28th Olympic Games in Athens  2005:wins two gold medals at the 48th World Table Tennis Championship ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
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