— Will you stay here for supper?

— Sorry, I _____ I'll have to meet my uncle at the station. [ ]

A. mustn't

B. can't

C. needn't

D. don't

蛤蚧有四足，四足均有五趾，五趾的特征是

A．五趾均具爪，趾底面具吸盘

B．五趾均具爪，趾底面无吸盘

C．五趾均具爪，趾间有皮膜相连

D．趾中有4趾具爪，趾底面无吸盘

E．趾中有4趾具爪，趾底面具吸盘