2013 高考数学第 2 题答案解析

2．已知集合为 R，集合 $A=\left\{x \left\lvert\,\left(\frac{1}{2}\right)^{x} \leq 1\right.\right\}, B=\left\{\mathrm{x} \mid x^{2}-6 x-8 \leq 0\right\}$，则 $A \cap C_{R} B=$
A．$\{x \mid x \leq 0\}$
B．$\{x \mid 2 \leq x \leq 4\}$
$C .\{x \mid 0 \leq x<2$ 或 $\mathrm{x}>4\}$
D．$\{x \mid 0