24（）

单项选择题Shortly after the tea Leopold heard the music from upstairs. He was astonished because（）

A．Wolfgang loved the piece so much
B．Wolfgang was playing in the darkness
C．Marianne had never played the piece so beautifully
D．Marianne was washing dishes in the kitchen

单项选择题We drop a piece of metal into a jar full of water, the metal will float if it weighs less than（）

A．an equal amount of silver
B．an equal amount of gold
C．all the water in the jar now
D．the water that leaves the jar