在科学实验中，为了减少获取实验数据的误差，常常设重复组，科学实验的数据，应当取各重复组的A．最大值B．最小值C．任意值D．平均值-七年级生物

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• It is important______English both in clsss and after class.[ ]A.to speak B.spokeC.are spookenD.speak
• Ihope ________you soon.[ ]A. to seeB. see C. seeingD. saw-九年级英语
• 当我们探究一个未知问题时，通常应按照一定的步骤进行。你认为正确的顺序是（）①作出假设②验证假设③发现问题④得出结论A．①②③④B．①②④③C．③①②④D．①④②③-七年级生物
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• We can’t afford ______ such an important customer. [ ]A. upsetB. to upsetC. upsetting-九年级英语
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• My friends often invites me ______ meals in their house.[ ]A. haveB.to haveC.having D. has-八年级英语
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