User Forum

Read the passage and answer the questions that follow.
MATERIALS
A material is what something is made of. There are 5 basic materials and they are metal, glass, wood, cloth and plastic. Most things are made with these materials such as a lot of things are made of metal, glass, wood, cloth and plastic. There are some other materials. But they are not used as much as these 5 materials.
Let's discuss about metal first. Metal is very heavy. And it is very hard and strong. It usually feels cool if you touch it. We use metal to make lots of things. We use it for forks and knives. We use it for keys. We use it for cars. We use it for these things because it is very strong.
Secondly, let's discuss about glass. Glass is very smooth. It feels cool to touch. It is not as heavy as metal. It is hard. But it is not strong. It breaks very easily! Then why do we use it? We use it because it is clear! You can see through glass! That's why we use it for windows. That's also why we use it for glasses.
Now, let's discuss about wood. Wood is lighter than metal and glass. It is not as strong as metal. But it is much stronger than glass. We use wood to make lots of things. Things made from wood are usually light and hard and strong. Chairs and tables are made from wood. Pencils are made from wood.
Now, let's discuss about cloth. Cloth is very light. It is much lighter than wood. And it is very soft. We use cloth to make lots of things. For example, it is used to make clothing. And it is used to make curtains, etc. Finally, let's discuss about plastic. Plastic is also very light. But it is different from cloth.
Sometimes it is soft. And sometimes it is hard. Plastic can be used to make thin plastic bags. These are light, soft and strong. But plastic can also be used to make bicycle helmets. These are light, hard and strong. A helmet and a bag seem different. But they are both made from plastic.

Which of these materials is not strong?

AMetal
BGlass
CWood
DPlastic