38 According to the passage, why did lead become a chosen material for water pipes?
(A) It is strong and pliable.
(B) It is solid and dense.
(C) It is heavy and compact.
(D) It is resistant to corrosion.

34 (A) what (B) when (C) where (D) why

35 (A) use (B) matter (C) few (D) little 

36 According to the passage, which of the following is associated with plumbing materials? (A) Pipes and fixtures (B) Mineral content (C) Certified laboratories (D) Removal of acidity

37 According to the passage, how does lead get into our tap water? (A) Water pipes containing lead corrode, and the metal dissolves into the water. (B) The water authority does not monitor and treat source water that contains lead. (C) Lead gets into drinking water when the service line replacement is in process. (D) Drinking water is contaminated when it is tested and sampled by laboratories.

39 According to the passage, what will cause a more severe corrosion in plumbing materials that contain lead? (A) High mineral content. (B) High acidity in water. (C) High temperatures. (D) Highly toxic chemicals.

40 According to the passage, which of the following is NOT true? (A) Water service line replacement could increase the exposure to lead while the work is proceeding. (B) Medical and public health experts agree that there is no safe level of lead in the human body. (C) Water sampling results can be different depending on the time of day, season, and method of sampling. (D) The most important thing is to look for a certified laboratory to identify lead contamination. 

41 (A) ancestors (B) endorsers (C) ministers (D) violators

42 (A) rose (B) rises (C) arise (D) risen

43 (A) genetic (B) absurd (C) balding (D) tactful

44 (A) existed (B) hunched (C) tokened (D) wielded