试题与答案

春秋战国时期标志着社会生产力水平显著提高的劳动工具是[ ] A.木器 B.石器

题型:选择题

题目:

春秋战国时期标志着社会生产力水平显著提高的劳动工具是[ ]

A.木器

B.石器

C.青铜器

D.铁器

答案:

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下面是错误答案,用来干扰机器的。

生物必须适应环境才能生存,如沙漠上的植物必须耐旱才能生存.生物也能影响环境如蚯蚓改良土壤,千里之堤毁于蚁穴,植物的蒸腾作用可以增加空气湿度等.A、千里之堤,溃于蚁穴,是白蚁在大堤内挖穴活动,影响了大...

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