Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious re

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• 植物生长中需要多种无机盐，其中需要量最大的是含_________、_________、_________的无机盐。-七年级生物
• —We are planning to have a casual get-together this Saturday or Sunday. Are you coming?— ________. I
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• ---- This store has such high prices.---- I agree. Never again ____ here.A．I will shopB．will I shop
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• Not until all the fish died in the lake __________ how serious the pollution was.A．did the villagers
• 在下列哪种溶液中培养，绿色植物会生长不良[]A．土壤浸出液B．蒸馏水C．无土栽培营养液D．自来水-七年级生物
• If carefully, the experiment will be successful.A．doB．doesC．doneD．doing-高三英语
• While ______ in Scotland, he made friends with the natives there.A．workingB．workedC．he worksD．he is
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• 按照下图的方法，取2个大小相同的萝卜，各从顶端向下挖一个大小相同的洞，在A萝卜洞内装上浓盐水，在B萝卜洞内装上清水，过一段时间后，观察萝卜洞内水位的变化并注意用手摸-七年级生物
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• Sitting under the willow trees ____ an old man.A．isB．areC．is thereD．are there-高三英语
• ________ these experiments were successfully completed would we think of going into humans.A．If onl
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• Only when they came ___________. A．I left the officeB．did I leave the officeC．left I the officeD．I d
• . Little ______ about her own safety, though she was in great danger herself.A．did Rose care B．Rose
• Never ______ such a good boss before I came to this company.A．do I meetB．I metC．had I metD．I had me
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• 有人将90千克土壤盛在木桶里，将重23千克的柳树苗种在桶中，只浇灌纯净的水5年后再次称量，发现土壤重量减少0.057千克，柳树重量增加74.5千克。柳树增加的重量主要来自[]A-七年级生物
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