能补肾阳，益精血的药物是：
A．杜仲
B．淫羊藿
C．肉苁蓉
D．续断
E．补骨脂
参考答案：C
We know that she enjoys ______ books very much.
A．read
B．reads
C．reading
D．to read
当基槽（坑）因土质不一挖成阶梯时，应先从最低处开始浇筑，按每阶高度，其各边搭接长度不小于mm。（）
A.400
B.450
C.500
D.550
