Unit 3
CD1
57
1
1
Listen and repeat.
[photo 073l]
Project
6
6
Find out how many
glasses of water you and
someone in your family
drink each day for a
week. Make a bar chart.
2
2
Watch the video.
blood
brain
skin
humans
4
4
Answer the questions.
Why does our blood need water?
2
How much of our brain is water?
3
From which part of our body do we lose
water when it’s hot?
4
What happens when we don’t drink
much water?
5
5
When do you think you should drink
more water?
All plants, animals, and humans need water
to live. That’s because our bodies need water
for nearly everything they do. Our blood needs
water to move around the body. Our stomachs
need water to digest food. More than 70% of
our brains are water, so drinking water helps us
think better.
When we do sports and when it’s hot, we lose
water through our skin. This body water is called
perspiration. We put water into our bodies when
we drink and eat. When we lose more water
than we put into our bodies, we feel tired and
we sometimes have a headache. That’s why it’s
important to drink 6–8 glasses of water a day.
CD1
58
3
3
Read and listen.
3
4
5
2
➞
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