Leto G2 百科知识大闯关2

What is our world made of？

• water

• people

• matter

What are the forms of matter?

• air、gases、liquids

• liquids、gases、solids

• liquid crystal、gases、solids

What is the characteristic of a solid?

• It takes the shape of its container.

• It fills its container.

• Its liquidity is not good.

• It keeps its shape.

Most solids are colored and visible.

• true

• false

All gases are colorless.

• true

• false

What is the process by which a gas becomes a liquid?

• liquefy

• evaporate

• solidify

• fuse

Which one will sink in the water?

• wood

• stone

• plastic foam

• oil

Which of the following is the densest?

• wood

• plastic foam

• stone

• oil

The heavier the object of the same size, the denser it is.

• true

• false

What harm is there in cola?

• It makes you fat.

• It can be used for cooking.

• It can be used for cleaning.

• It will give you a tooth decay.