38. What does the word “saliva” mean? (A) a kind of starch (B) a kind of protein (C) juices of the mouth (D) sodium in the mouth

36. Which of the following statements cannot be inferred from the passage? (A) Gray water cannot be used to water the flowers directly before it is filtered by sand. (B) It is possible to reuse gray water in a house without a built-in recycling system. (C) It is prohibited to let gray water overflow into your neighbor's yard. (D) Recycling water helps cut down your water bill.

38. What does the word “saliva” mean? (A) a kind of starch (B) a kind of protein (C) juices of the mouth (D) sodium in the mouth

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38. What does the word “saliva” mean?
(A) a kind of starch
(B) a kind of protein
(C) juices of the mouth
(D) sodium in the mouth