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23. It is a useful change in materials to one's environment.
A. Burning of old tire.
C. Plastic bottle can used as flowerpots.
B. Throwing of garbage in the canal. D. Cutting of trees.
24. It is a harmful change in materials to one's environment.
A. Cutting of fabric to be made into clothes.
B. Burning of garbage
C. Plastic bottle can used as flowerpots.
D. Old tire can used as chair or plant pots
25. How can harmful changes in materials affect one's environment?
A. It can cause land pollution.
C. It can cause air pollution.
B. It can cause water pollution.
D. All the choices.
26. How should non-decaying wastes be disposed?
A. by composting
B. reusing
с
recycling
D. both B and C
27. What should people do with the garbage to prevent oneself from getting sick?
A. dispose waste materials properly
B. take medicine
C. throw the waste materials anywhere in your surroundings.
D. drink untreated water.
28. The following changes in the materials are used to the environment except:
A. using eco bag when buying groceries.
B. using both sides of paper
C. using pesticides in killing insects.
D. using plastic bag when shopping
29. Which of the following changes in the materials is useful to environment?
A. throwing garbage in the canal
B. using paper bags when shopping
C. throwing hospital waste into river
D. using plastic bags when shopping
30. If you are going to dispose waste materials commonly found at home, what are you
going to do with the decaying materials?
A. make a compost
B. mix them with the non-decaying
C. throw them in the river
D. keep them in the cabinet and use them again​