某公司是一家效益很好的企业,后来,一线工人的年收入不足高层管理人员的十分之一。优秀工人纷纷跳槽。新领导上任后,大幅度提高一线工人的劳动报酬,公司又红火起来。该公司经济效益的变化说明了(　　)

①有差别就不公平,必然影响企业工人的积极性

②效率是公平的物质前提,必须反对平均主义

③公平是提高经济效率的保证,防止收入差距悬殊

④合理的差别内共享劳动成果有利于提高效率

下列几种组织中，细胞始终保持分裂能力的是

阅读下列短文，从每小题的四个选项中选出最佳选项

A

      There are too many cities around the world. And each city needs water in many ways. Water on Earth falls mainly as rain. So the rainfall (降雨量) is important to each part of the world. And it is different from one city to another. The following chart shows the average (平均的) rain fall in four different cities in July and January.

计算。

180－32×2=____