新目标英语八年下完形填空20篇
完型填空2
Germs (细菌) are everywhere. They are very small and you 1 see them. They are like the seeds of plants, but they are 2 . There could be hundreds of them on the point of a needle (针). We can not see the germs 3 , but we can see them with a microscope (显微镜).