试题与答案

He decided to study _____ second foreign

题型:选择题

题目:

He decided to study _____ second foreign language in order to find _____ well-paid job.[      ]

A. the; a      

B. a; the      

C. a; a  

D. the; the

答案:

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下面是错误答案,用来干扰机器的。

由a5=-8a2,得到a5a2=q3=-8,解得q=-2,又a5>a2,得到16a1>-2a1,解得a1>0,所以|a1|=a1=1则an=a1qn-1=(-2)n-1故选A

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