8.C作出图形如下所示,易得四边形ABB1A是正方形,由P是线段AB的中点得P是线段AB的中点,又Q是线段BC1的中点,故PQ∥A1C.由ABCD-ABCD是正方体易得DD⊥平面ABCD1,∴DD⊥4C1,∴DD⊥PQ,故①错误;由ABCD-ABCD是正方体易得AC1⊥平面BDDB1,∴PQ⊥平面BDDB,故②正确;PQ=AC=AB1,故③正确;如图,过D1作直线l∥4C1,l与直线BC1,BA分别交于点S,T,连接SQ,PT并延长,交于点N,可知四边形 MNRD即为平面PQD截正方体所得的截面,故④正确.故选C

第二节书面表达One possibleversionDear friendsOur school produces a lot of rubbish every day, suchas leftover food, waste paper and plastic bottles, whichbrings a wideofental problems as well asthe waste of resources. Therefore, it,s time we tookmmediate action to change the situationFirst of all, it is necessary for us to raiseawareness ofenvironmental protection and develop the good habit ofgarbage sorting, What's more, we should voluntarilydifferentiate recyclable rubbish from non -recyclables inour daily lifeIn a word, if everyone does his/ her bit responsiblyortinghool will become better andbetterThe Students' Union

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