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5. The leaves of these trees are
to cattle.
A. poisoner
B. poisony
C. poisoning
D. poisonous
6. The lakes has been
with toxic waste from some local factories.
A. pollute
B. pollution
C. pollutes
D. polluted
7. Many people have received
treatment.
A. medicine
B. medic
C. medical
D. medically
8. Many scientists are concerned
the environmental problem today.
A. in
B. on
C. about
D. of