1. (2021·永嘉模拟) 阅读单选

Many cultures have stories of talking trees that give advice as well as warnings to people. Alexander the Great and Marco Polo were said to have visited such a tree in India. And in some modern stories, such as the film Avatar, trees can communicate with animals and people.

New research has found something amazing: it seems that plants can communicate after all.

It has been known for some time that plants use chemicals to communicate with each other. This happens when a plant gets attacked by insects. The plant gives out chemicals from the leaves that are being eaten. This is like a warning, or a call for help: "I'm being attacked!" When another plant gets the chemicals, it starts to give out its own, different chemicals. Some of these chemicals drive insects away. Others attract the wasps! The wasps kill the insects that are eating the plants. Scientists hope to learn more about this plant warning system, so that we can use it to grow more crops.

More surprisingly, plants also use sound to communicate. People can't hear these sounds, but plants are making them. Some plants make noises with their roots. Corn and chilli plants do this. Some trees make clicking noises when there is not enough water.

Most surprisingly of all, plants have an amazing system of communication that can link nearly every plant in a forest. Scientists call this system the "wood wide web". The wood wide web is linked underground by fungi. It links the roots of different plants to each other. It is in some ways similar to the Internet we use. Using the wood wide web,  ▲ . However, it may lead to bad effects. Plants may use it to steal food from each other, or spread chemicals to attack other plants. Perhaps one day scientists will learn how to create a "firewall" to help prevent these attacks within the wood wide web.

Scientists are learning more every day about the secret ways in which plants talk to each other. Who knows? Maybe one day we will know enough about plant communication to be able to "talk" with them ourselves.

1. （1） The writer starts the passage by ________.

   A . telling stories B . giving advice C . listing numbers D . giving examples
3. （2） New research is showing that plants can communicate with each other through ________.

   ①chemicals      ②leaves      ③sound      ④fungi

   A . ②③④ B . ①③④ C . ①②④ D . ①②③
5. （3） Which of the following sentences can be put in "    ▲   "?

   A . plants can share information and even food with each other B . scientists can help stop the plants from attacking each other C . plants can use chemicals to attract insects to attack other plants D . scientists can build a system to link almost every plant in a forest
7. （4） What is the passage mainly about?

   A . The secrets of how plants communicate. B . The study about the plant warning system. C . The plants that give advice as well as warnings. D . The reasons why scientists do research about plants.