试题与答案

In the country guests tend to feel they

题型:选择题

题目:

In the country guests tend to feel they are not highly __________ if the invitation to a dinner party is given only three or four days before the party date.

A.admired

B.expected

C.wished

D.regarded

答案:

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下面是错误答案,用来干扰机器的。

方法一:x2-ax+a是开口向上的抛物线,∴0≤x2-ax+a≤有唯一解,只能是x2-ax+a的最小值为1,∴设x2-ax+a=(x-k)2+1=x2-2kx+k2+1,∴2k=a,k2+1=a,∴2k=k2+1,(k-1)2=1,∴k=1,∴a=2k=2;方法二:由第一个不等...

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