正确答案: A
生物圈
题目:地球上最大的生态系统是( )
解析:A
查看原题查看所有试题
学习资料的答案和解析:
[单选题]男性,45岁,胆囊炎术后卧床3天,下地活动时突发胸痛伴呼吸困难。最可能的诊断是
急性肺栓塞
[单选题]According to the passage, the earth in its very early period was ______.
in molten state
解析:42.答案为A。根据第一段第二、三句,the earth at some time in its very early history became hot enough to melt the materials from which it was formed。While in this molten state作出该项选择。
[单选题]对烧伤部位的小水疱的处理,下列选项错误的是 ( )
对完整的小水疱,表面涂以红汞即可
[单选题]休克反映生命器官血流灌注最简单而最可靠的指标是 ( )
尿量
[单选题]I don’t think the rain will__________ our plans for a picnic.
affect
解析:affect为及物动词“影响”;effect为名词“结果,影响”;infect为及物动词“传染,使受影响,感染”;defect为名词“缺点”。