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.