昆虫是节肢动物在陆地发展（）的一纲。

酒店客房检查的内容为（）

A、清洁卫生质量

B、物品摆放

C、设备状况

D、整体效果

食盐为何能产生保藏作用？

The promised wage increase is being held back while it is examined by the government to see if it is greater than the law allows.

A．dismissed

B．delayed

C．neglected

D．rejected

简述预测系统的重要性。