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The students all stood up when the teacher _______ (进入)the classroom.
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若复数z1=1-2i,z2=i,则|z1+z2|=______.
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In the 1940s, Pinehaven Park was one of Crafton City's loveliest recreation(娱乐)areas.
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Her uncle is a reporter. (对划线部分提问)
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For many years, no one could communicate with people who had been born without hearing.
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