完形填空。 As we all know, human beings have

问题：

完形填空。

      As we all know, human beings have five senses.  1.________    have you ever heard that

instead of having five senses like humans, plants have just one or two senses?

     Some plants can sense sunlight and grow towards it. Plants   2.________   feed on small

insects can sense the soft touches of the insects on their leaves.   3.________  they sense the

insects, they move their leaves all of a sudden to catch them. Scientists have found that plants

can feel  4.________    the animals around them want to hurt them or not.   5.________   is

even more amazing are the results of  6.________   recent experiment carried out by some

Italian and German biologists. According to their report, when some plants sense dangerous

insects, they give  7.________   a kind of smell to pass the information on to   8.________  

plants. The smell also attracts other insects which will kill the dangerous ones. In this way, the

plant can avoid being eaten.