法一经制定和公布实施，必须保持其严肃性，而不能任意变动，这是法的（）
A、稳定性
B、原则性
C、权威性
D、连续性
参考答案：A
情景对话（每题1分，共5分）请将正确答案序号填到题号前，有两项为多余选项。
小题1:—I am sorry, I couldn’t find the book you want to borrow.
—I am sorry, I couldn’t find the book you want to borrow.
—________
小题2: —How was your visit to Lake Tai？
—______
小题3:—Professor Wang, I haven’t finished my paper.
—Professor Wang, I haven’t finished my paper.
—_____. You have some time left.
小题4:- The car looks nice. Could I have a try before I decide to buy it?
- _____________
小题5:—Would you like another piece of cake?
—Would you like another piece of cake?
—___________. I’m still hungry.
唯一具有镇痛作用的静脉全麻药是（）
A.硫喷妥钠
B.氯胺酮
C.丙泊酚
D.依托咪酯
E.咪哒唑仑
