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Writing 15Dear mikeI am writing to sincerely[文] apologize[章] for the fact that Ican't go to the high-spee[来]d railway station to pick you uptomorro[自]w because I have to take an important[知] testtomor[嘛]row morning.I[答]t's unnecessa[案]ry for you to worry about it. I will letmy fiend Li Ming. who you met with last year. meet youat the station with a small gift that you have been longingfo[网]r for a long timeFor the sake of naking up for my absence anddwelco[文]ming youI will treat you to Chinese food in arestaura[章]nt in the evening after you arrive.Yo[来]urs
20.C【解析】女[自]性一个生殖细胞正常[知]减数分裂形成一个卵[嘛]细胞和三个极体,都[答]只含有1条X染色体[案];如果女性出现4条[网]Ⅹ染色体,额外的Ⅹ[文]染色体可能都是母源[章]的,那么父方提供1[来]条X染色体,母方提[自]供3条X染色体;应[知]是减数分裂过程发生[嘛]了两次异常,减数第[答]-次分裂过程中,两[案]条X染色体都移向了[网]次级卵母细胞,形成[文]的第-极体不含X染[章]色体减数第二次分裂[来]时.有一条Ⅹ染色体[自]的姐妹染色单体移向[知]细胞两极,而另一条[嘛]X染色体的姐妹染色[答]单体移向同一极,所[案]以形成了1个具有3[网]条X染色体的卵细胞[文]和1个具有1条X染[章]色体的极体。因此两[来]次分裂都出现异常.[自]减数分裂产生的四个[知]细胞中,只有一个极[嘛]体是正常的。故选C[答]
