下列何药为温肾壮阳，补督脉，益精血的要药
A．巴戟天B．杜仲C．狗脊D．蛤蚧E．鹿茸
参考答案：E
I don't believe Jim is able to design a digital camera, ______?[ ]
A. is he
B. isn't he
C. doesn't he
D. does he
大气污染
