Our world is full of animals and plants.They make the world lively and colourful.Every living thing needs to reproduce（繁殖）to create more members.How do plants reproduce？They have to spread their seeds to other areas.Plants have developed all kinds of ways to do this.
   The simplest way to spread seeds is through gravity（重力）.Many seeds are inside of fruit.When fruit gets too heavy，it falls from a tree to the ground.Apples spread this way.When you see this happening，you'll think of a certain scientist.
   Some plants use wind to spread their seeds.Dandelions（蒲公英）are a good example of this.Dandelion seeds are so light that when wind blows，it carries dandelion seeds to new places.Maple （楓樹）seeds also use wind.Their seeds are connected with long，thin leaves that look like wings.When the seed falls from the tree，its "wings" help it fly farther from the tree.
   Some animals help plants spread their seeds.Sometimes animals pick up the fruit and drop it in another area.That helps move the seed even farther away.Some animals eat the seeds：While the seed is in the animal's body，it stays whole.When the seed leaves the animal，it's in a new place.Ants also help spread seeds.Some seeds have a special smell that appeals to ants.The ants bring the seeds back to their home，which of course is underground.They only eat part of the seed.They leave the rest of the seed underground.After that，the seed can start growing.

（1）What do plants have to do to reproduce？

B

B

A．They have to make the world lively and colourful.
B．They have to spread their seeds to other areas.
C．They have to fall to the ground.
（2）Which scientist do you think of when-you see apples fall to the ground？

A

A

A．Newton.
B．Thomas Edison.
C．Albert Einstein.
（3）How do dandelions and maples spread their seeds？

A

A

A．They use wind.
B．They use ants.
C．They use animals.
（4）In the last paragraph，what does the underlined word "they" probably refer to（指）？

C

C

A．Animals.
B．Plants.
C．Ants.
（5）What's the best title for the text？

B

B

A．Why Animals Pick Up Seeds？
B．How Plants Spread Seeds？
C．How Wind Helps Seeds Spread？