With what topic is the passage mainly concerned? [br] It can be inferred from th

游客2023-09-17 30

问题 With what topic is the passage mainly concerned? [br] It can be inferred from the passage that insects do not have______.

选项 A、brains
B、backbones
C、nerve cells
D、reflexes

答案 A

解析昆虫是低等生物，它们有backbones(脊骨)，nerve cells(神经细胞)和reflexes(反射能力)，而没有高等动物才有的brain。文章第二段谈到：最小的鱼也比最大的昆虫的大脑大，这也就是说，昆虫等于没有大脑。

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