繁殖优良品种的果树花卉时，为了保持这种品种的优良性状，不宜采用的方法是[]A．种子繁殖B．扦插繁殖C．压条繁殖D．嫁接繁殖-八年级生物

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• 随着科学技术的迅猛发展，植物组织培养技术已广泛应用于生产实践中。这一技术[]A．可防止植物病毒的危害，提高农业生产效率B．可培育抗病毒的植物新品种C．可有目的地改变母体的-八年级生物
• 根据所学知识，回答下列问题：（1）请写出绿色植物进行光合作用的反应式___________________。（2）“妃子笑”是优良荔枝品种，为了保持其优良性状，最好用__________方法繁殖。（3
• If you listen to English programs every day, I’m sure you’ll _______ make progress in English.A．fre
• 直供上海世博会的蔬菜有六成来自山东。按照世博会的要求，所有专供蔬菜都要达到绿色食品标准。请分析回答下列问题：（1）绿色食品是经权威机构认定并使用专门标志的安全、优质、-八年级生物
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• 植物园里的几株国家二级保护植物——蕨类植物桫椤感染了植物病毒，为了培育出大量无病毒的桫椤植株，你认为应采取的方法是[]A．用带毒植株的种子培养后代B．用带毒植株无明显症状-八年级生物
• 在嫁接植物时，成功的关键是：[]A．选好砧木B．应使砧木和接穗的树皮连在一起C．选好接穗D．应使砧木和接穗的形成层紧密结合-八年级生物
• Last year John earned________his brother did，who has a better position in a bigger company.A．twice a
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• 分析回答下列有关植物扦插和嫁接的问题：（1）再用植物扦插繁殖时，一般茎段保留两个节，茎段上方的切口是________，下方的切口是______，对上一个节上的叶要_________，对下一-七年级生物
• 现有一种非常珍贵而又很难用种子繁殖的苗木，若让它在短时间内大量繁殖，可以采用的方法是[]A．组织培养B．扦插C．嫁接D．有性生殖-七年级生物
• (2013·沈阳二中模拟)She devoted herself________to her research and it earned her a good reputation in her f
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• Dream of the Red Chamber is ________worth ________because we can learn alot about the noble familie
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• 下列植物中，常用扦插繁殖的是[]A．甘薯和银杉B．葡萄和月季C．梨和苹果D．菊花和金鱼藻-八年级生物
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