What'shedoing? Heis ___________ abike.[

His English is improving _______, which makes both his parents and his teacher happy.

A．now and then

B．little by little

C．sooner or later

D．one after another

在下列类型的多媒体数据文件中，Windows媒体播放器(Windows Media Player)软件不能播放的是

A．MIDI

B．WAV

C．MPEG

D．JPEG

白煮能保持原料的本色和（）。

A、鲜味

B、原味

C、香味

D、气味

不能被共同偏好规则区分优劣的组合有？

生产指令