เฉลยแบบฝึกหัด เรื่อง Understanding Cause and Effect

Ex. A (page 14-15)

1. a.keep chicks warm

2. b. learn to fly more quickly

3. c. looks like cotton in the wild

Ex. B (page 15)

1. Because the center of the trunk is rotten and the bird’s nest will be soft

2. Because people cut down older pine forest. (So the birds have no place to live)

3. Because they cut them down for wood. (Because they need wood)

Ex. C (page 16)

2. Effect: they (Fish) swim in groups.

3. Effect: people settled down near rivers.

4. Cause: Owls see well in the dark.

5. Effect: the game birds can’t see them

Ex. D (page 17)

1. c. The birds have died out.

2. b. Industrial waste and drying up of the lake.

3. a. They face extinction.

Ex. E (page 18)

2.  Cause : I planted some trees. 
 Effect : We get more oxygen. 
 Sentence: I planted some trees. So, we get more oxygen. (wolf101-01)

M.Tum : We get more oxygen because I planted some trees.

3.  Cause : My sister stayed up past midnight. 
 Effect : she got up late.
Sentence: My sister stayed up past midnight. So, she got up late.(eagle103-03)

M.Tum : My sister stayed up past midnight. Therefore, she got up late.

4. Cause : Lena missed school on Monday. 
Effect :  She didn’t know what her friend study on Monday.

Sentence: Lena missed school on Monday. So, she didn’t know what her friend study on Monday. (eagle103-04)

M.Tum : Lena didn’t know what her friend study on Monday since she missed school on Monday.

5. Cause : David signed up for French classes. 
Effect :  He can speak French.

Sentence: David signed up for French classes. So, he can speak French. (horse106-04)

M.Tum : David can speak French because he signed up for French classes.

Ex. A (page 19)

1-d

2-c

3-a

4-f

5-b

6-e

Ex. B (page 19)

1	x
2
3
4	x

Ex. C (page 20)

Cause

Effect

Conjunction (Linking word)

1. Tony away from school as he was in the hospital

2. Pen- chan was scared, so she called for help

3.There was a strike and the buses did not ply

4.The plants died as there was no water

5.Eric forgot his swimsuit and therefore could not swim

6.The street lights were switched on, so we could see our way

7.The match was abandoned when it rained

8.He lost control of his car as the brakes were faulty