—Did you have great fun during your stay in the restaurant?

—Yes, _____.[ ]

A. it was so wonderful

B. it was difficult

C. it was terrible

D. it was such a long trip

比重比水小的东西会浮在水面上，比重比水大的物体则会沉入水底。木头与铁块绑在一起后沉到了水底。由此可知， ( )。

A．木头与铁块的比重都比水大

B．该木头与铁块的平均密度比水大

C．木头的比重比水小

D．铁的比重比水大