— Jack failed the driving test again. ?— The question is_____ we can help him avoid making the same

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• Many experts hold the view ________ teacher development is________ the key to better education lies.
• Cheer up! Everyone may have periods in their lives everything seems tough. [ ]A. which B. whereC. wh
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• 必须通过有性生殖过程才能实现的是（）A．同一株菊花上绽放出不同的花朵B．生产胰岛素“工程菌”的培育C．克隆羊“多利”的问世D．“试管”婴儿的诞生-生物
• 如图是绿色开花植物子房的结构及受精过程示意图，请据图回答下列问题（1）花粉落到柱头上的过程叫做______．图中①表示花粉粒受到柱头上黏液的刺激开始萌发，生出[______]______-生物
• 下面是一些常见生物：玉米、乳酸菌、草履虫、家蚕、蝗虫．根据你所学过的知识，回答下列问题：（1）进行有性生殖的生物有______．（2）单细胞生物，但没有成形细胞核的是______．（3）家-生物
• 人们常用分根、扦插、嫁接等人工的方法来繁殖花卉和果树，主要是因为这种生殖方式能够（）A．使后代保持亲本的优良性状B．产生优于亲本的品种C．操作简便D．能大量繁殖-生物
• （每题1分，共8分）（1）嫁接成活的关键因素是嫁接上去的芽应该大而饱满（）（2）植物的组织培养技术是利用有性生殖的原理（）（3）无性生殖与有性生殖相比具有繁殖速度快，品质优良的特-八年级生物
• The last time we had great fun was ______ we were visiting the Water Park. [ ]A. when B. how C. wher
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• We had worked only one hour it began to rain so heavily that we had to put up our tent.[ ]A. before
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• 下列实例，属于有性生殖的是（）①“试管婴儿”的诞生②“克隆羊”的出现③“脱毒土豆”的培育④生产胰岛素“工程菌”的培育⑤蕨类植物的生殖．A．①③B．②④C．③④D．①⑤-生物
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• 玉米在开花时若遇连绵阴雨，果实的产量将降低。其原因是（）A．阴雨天气影响了子房的发育B．阴雨天气缺乏阳光C．风大，气温低，影响营养的吸收D．花粉被雨水打湿冲落，影响花粉的传-八年级生物
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• 某果园的苹果树大都产量较低、果实品质欠佳，若要尽快更新为优质苹果树，提高果实的品质和产量，你认为最好应采取下列哪一措施？（）A．果枝扦插B．果枝嫁接C．种子繁殖D．全部换栽-八年级生物
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• 下列植物的繁殖方法，属于有性生殖的是（）A．用月季花枝条繁殖B．用藕茎繁殖C．用秋海棠叶繁殖D．用玉米种子繁殖-生物
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• _____ worries me is _____ we're going to pay for all this.[ ]A. It; that B. That; how C. What;