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Although he failed this time, he didn't give up and ________ studying hard.
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Difficulties are nothing _____we are not afraid of them.
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News Review Head-on Train Crash On May 18,two trains had a head-on crash (正面相撞) near New York City.
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2005年10月12日宇航员______,______乘坐_________飞船再次上天.
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lim n到正无穷 (3n+1)/4n-1等于3/4用数列极限的定义证明
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