Now he is improving his English by _____ of reading and listening to it a lot every day. |
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A. method B. approach C. way D. means |
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你能帮帮他们吗
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已知数列{an}中,a1=2,a2=1,a(n+2)-5a(n+1)+6an=0(n∈N*),求数列{an}的通项公式
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