2. 36
1.2
41 41
Purposive Sampling
2.
4
2
2554
3.
2551
4
4
4 2 8
3.1 Unit : Environment Topic : How to
preserve environment
1
3.2 Unit : Free time Topic : Arts
1
3.3 Unit : Health Topic : Narcotics prevention
1
3. 37
3.4 Unit : Science and Technology Topic :
Impacts
1
1.
1.1
2.
Multiple Choice
40 4
1.1 2551
1.2
Unit : Environment Topic : How to
preserve environment Unit : Free time Topic : Arts Unit
: Health Topic : Narcotics prevention Unit : Science and