下列没有脊椎骨的脊椎动物是（）。
A.海鞘
B.鲤鱼
C.文昌鱼
D.七鳃鳗
参考答案：A
—Would you please carry the heavy bag for me?
—_______[ ]
A. No problem!
B. What a pity!
C. Not at all.
D. Thank you.
WWW是（）的缩写
A.World Why Wait
B.World Wait Wad
C.World Wate Want
D.World Wide Web
