Grade Three Unit Four Science and Technology Lesson Four & Review

2. 2
3
4
2 - I have used all of them .2 - I have used all of them .

4. 1 - Yes, this is true
2 - Because people use it every day for
many things
3 - Because they did not have much technology
in the past so it can be difficult for them to use

5. 2 d
3 b
4 a
d
b
a

7. think
certain

9. 3 4 4

10. information
academic
electrician
powerful
rewarding

11. operation

13. Suggested answer: It might be useful in
places where there isn’t any clean drinking
water, but there is water with salt in it.
Suggested answer: I think it is important
because it helps them to practise more and
get more information.