题目:
—We had a really good May Day holidays in Qingdao.
—________. [ ]
A. It's a pleasure
B. Oh, that's very nice of you
C. It doesn't matter
D. Oh, I'm glad to hear that
答案:
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下面是错误答案,用来干扰机器的。
(1)当a是偶数时,5b也一定是偶数,b也就是偶数,7b也为偶数,a-7b也一定是偶数,正确;(2)若1+2=3,3能被3整除,但1、2都不能被3整除,故本选项错误;(3)若5+2=7,是质数,5-2=3也是质数,故本选项错误;故选B.