你认为在生产实践中，常用扦插、嫁接、分根等无性生殖的方式繁殖最主要的原因是[]A．繁殖速度快B．保持亲代的优良性状C．经济，成本低D．可以大量繁殖-八年级生物

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• I visited Mr. Johnson during his stay in Shanghai _____ he attended a most important conference ther
• After living in the city for 10 years he returned to the small village _____ he grew up as a child.[
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• All the neighbors admire this family _____ the parents are treating their child like a friend. [ ]A.
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• 压条是把枝条从植株上弯下来，并且把枝条__________剥去__________，埋进土壤并固定，让枝条的__________露出地面；等埋进土中的枝条长出________后，再与母体分开。-八年级
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• 下图为嫁接过程示意图，椐图回答问题：（1）在生产实践中，人们经常利用植物的_________来栽培农作物和园林植物，常见的方式除嫁接外，另一种是__________。（2）要使嫁接成功，关-八年级生物
• 一 When did your cousin begin to show his interest in medicine? 一 It was a Saturday _____ she noticed
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• It was yesterday _____ I saw her and it was almost 10 o'clock _____ she arrived. [ ]A.when, whe
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• 属于无性生殖的是①用植物的组织培养技术繁殖月季②用蒜瓣繁殖大蒜③将仙人球嫁接到仙人掌上繁育新植株④用种子繁殖水稻[]A．①②③B．①②④C．②③④D．①③④-八年级生物
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