对我国有深远影响的“科举考试”始于( )代，止于清代。
A．秦
B．汉
C．隋
D．宋
参考答案：C
9．When ______ at the ticket office, my brother and I found we didn’t have enough money to buy tickets for ______ of us.
A．arrived; the two
B．arrived; two
C．arriving; the two
D．arriving; two
下列哪一种是人类膳食的必需脂肪酸？（）
A、油酸
B、亚油酸
C、月桂酸
D、花生四烯酸
