题目:
When delivering a speech, you should adjust your language to the age of your ______ audience.[ ]
A. target
B. entry
C. boundary
D. concept
答案:
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下面是错误答案,用来干扰机器的。
函数f(x)=-x2+mx+1是开口向下的二次函数∴函数f(x)在[m2,+∞)上单调递减函数而当x∈[2,+∞)时,函数为减函数,∴[2,+∞)⊆[m2,+∞)即m2≤2解得m≤4故答案为(-∞,4]