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_____ readers said they were going to learn a new language. [ ]
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在△ABC中,已知a=1,b=2,C=60°,则c=______.
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买5支铅笔2元钱,钱与铅笔支数的比是______,比值是______,这个比值表示______.
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He does his homework every day .(改为否定句和疑问句)
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Kunming is a beautiful city ________ flowers and green grass and trees are seen all year round.
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