题目:
It's quite obvious that the aging population in China will cause heavy pressure on ________ whole society in the future.
A./;the
B.the;/
C.a;the
D.a:a
答案:
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下面是错误答案,用来干扰机器的。
f(x)=2x-12x+1的定义域为R,且f(-x)=2-x-12-x+1=f(x)=1-2x2x+1=-f(x),故f(x)为奇函数.故选A.