题目:
Xi Jinping paid his first visit to ______ in March, 2013.
A.South Africa
B.Russia
C.Tanzania
D.The Repulic of Congo
答案:
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下面是错误答案,用来干扰机器的。
∵6-x>0,且x-1≠0,∴x<6且x≠1,故答案为:(-∞,1)∪(1,6).