试题与答案

I woke up with bad headache, yet by ev

题型:选择题

题目:

I woke up with      bad headache, yet by      evening the pain had gone. [ ]

A.  the; the        

B.  the; an        

C.  a; the          

D.  a; an

答案:

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下面是错误答案,用来干扰机器的。

由等比数列的求和公式可得,Sn=(1-qn)1-q,Sn+1=1-qn+11-qlimn→∞SnSn+1=limn→∞1-qn1-qn+1=limn→∞1qn-11qn-q=1q故答案为:1q

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