鉴别淋证与癃闭的关键点在于
A．有无小便短赤灼热
B．有无排尿困难
C．有无小便浑浊
D．有无排尿疼痛
E．有无小便量少
参考答案：D
锯削硬材料要快些，锯削软材料要慢些。
He looked quite healthy though he was ____.
A．in seventy
B．in his seventies
C．at seventies
D．age of seventy
