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.D【解析】该DNA分子上分布有大约4400个基因,每个基因的平均长度约为1000bp,则所有基因含有的碱基对总数约为4.4×106个,小于DNA分子含有的碱基对总数,这同时也说明DNA分子上有非基因片段。故选D

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