英语周报高一，北师大版第20期答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

4.D【解析】由“丈夫和妻子染色体数目正常且不患遗传病,生了一个只患甲种单基因遗传病的女儿”分析可知,甲种遗传病为常染色体隐性遗传病,A正确;红绿色盲为伴ⅹ染色体隐性遗传病根据夫妻的基因型可判断此家庭中儿子患红绿色盲与母亲减数第二次分裂异常有关,B正确;此家庭中妻子同时含有甲病致病基因和红绿色盲基因,C正确:甲种遗传病是常染色体隐性遗传病,在男性群体和女性群体中发病率相等,其发病率小于致病基因的基因频率,D错误。

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