英语周报七年级下册2021-2022 55期答案

19.(1)2M灬s3+70,2nO3+4S02(2分)将反应物粉碎、适当增大空’(的通人量(合理即可,2分)(2)BD(2分)(3)蒸发浓缩、冷却结品(2分)(4)过滤(1分)漏斗烧杯(1分)(5)9.71×10(2分)

第一节短文改错（共10小题：每小题1分，满分10分）Bad news struck me this morning when I got a call say that an old friend had passed away.①sayingThis old friend was seen almost to a family member three decade ago.He was once a big help②as③decadeswhen we were young but faced a lot of difficulties.Later,we grew up and get separated for personal④and⑤gotreasons.As time went by,we were ou of te touch.Her sudden death greatly saddened me and mixing feelings about the past were aroused.Once⑦His⑧mixedagain I realized that we should cherish those we really care and do what we canAthey're still with⑨when/while/ifus,or else any regrets will be left behind.⑩some

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