道德评价的标准
A．美与丑
B．虚与实
C．公与私
D．善与恶
E．人与物
参考答案：D
He turns a deaf ear to his parents, _____ many times they have pointed out his weakness.
A．whatever
B．whichever
C．whenever
D．however
道家为何重视炼气？
