作出假设是实验研究的一个重要环节，这是对问题作出各种尝试性解释。（）-七年级生物

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• His hobby is _____ all kinds of different telephones.[ ]A. collectsB. collectedC. to collectD. colle
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• 根据实验目的和实验原理选择恰当的实验器材（试剂），是保证实验获得可靠结果的关键因素之一。下列实验器材（试剂）的选用正确的是（）A．用显微镜观察植物花的结构B．用菜青虫成虫探-八年级生物
• —Would you like______ a cup of tea?—No, thanks. I am not thirsty. [ ]A. haveB. having C. hasD. to ha
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• 生物学实验中，规范的操作是（）A．用手抓住玻璃试管直接加热B．嘴吹熄灭酒精灯C．用放大镜观察临时制作的装片D．实验结束后整理实验桌-七年级生物
• They expect ______the work next Tuesday.[ ]A. finishB. finishingC. will finishD. to finish-九年级英语
• -- My brother is ill in hospital. -- I am sorry _________that. [ ]A. hear B. hearing C. to hear-八年级英
• It is important______English both in clsss and after class.[ ]A.to speak B.spokeC.are spookenD.speak
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• -Do we need ____?-Yes, we do.[ ]A. happy B. be happy C. to be happy D. being happy-九年级英语
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• John tired ________after he fell off the his bike, but he failed.[ ]A. not cryB. didn't cry C.
• 科学家为证实自己所提的假设，常以什么作为重要的支持依据？（）A．观察B．假设C．实验D．推论-七年级生物
• Tomorrow's meeting is very important. Please ask them ______ there on time.[ ]A. go B. going C.
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