17. Which is not a preventive measure to avoid food and
A. boil drinking water.
B. Wash your hands thorouly with soap and water after using the toilet.
C. Eat foods sold outside the school.
D. Cook food properly, especially pork and chicken
18. Which of the following is not a sign and symptom of dengue fever?
A. high fever (40%)
B. difficulty in talking
C. rashes
D. severe headache
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