49. Which of the following is closest in meaning to “malignant”? (A)concentrated (B)radioactive (C)synthetic (D)hazardous

50. What is the purpose of mentioning sounds and odors in the fourth paragraph? (A)To describe how slowly different types of plastic materials deteriorate. (B)To explain why experiments are sometimes necessary for artifact conservation. (C)To demonstrate how museums detect plastic decay without advanced technology. (D)To outline the conventional conservation methods used in museums.

49. Which of the following is closest in meaning to “malignant”?
(A)concentrated
(B)radioactive
(C)synthetic
(D)hazardous

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