英语周报七年级新目标44期2019－2022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!

13.B【解析】由图可知,该细胞处于有丝分裂后期,每个着丝点分裂成两个,姐妹染色单体分开,成为两条子染色体,因此该细胞具有四个染色体组,A相符、B不相符;①②为非同源染色体,非同源染色体上的基因为非等位基因,C相符;染色体②和③的大小、形状不同,因此若图中的②表示X染色体,则③表示Y染色体,D相符。

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