四年级下册下课时练习(一课一练含答案)第一单元-7 纳米技术就在我们身边课时练
7纳米技术就在我们身边课时练第一课时一、读拼音,写汉字。1.bīnɡxiānɡ()里面用到一种纳米涂层,具有杀菌和chúchòu()功能,能够使食物bǎozhìqī()更长。2.纳米技术可以实现jíbìnɡ()的早期检测与yùfánɡ(),让人们更加jiànkānɡ()。未来的纳米机器人可以通过血管直达bìnɡzào(),杀死癌细胞。二、给下面画线的字选择正确的意思,填在相应的括号里。疾:①疾病;②痛苦;③痛恨;④急速猛烈。群马疾驰()疾恶如仇()积劳成疾()疾苦()三、写出下列词语的近义词。预防()健康()普通()新奇()先进()四、根据解释写词语。1.是指通过一平面图形或立体(如圆、圆锥截...
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