48. According to the passage, which of the following may particularly accelerate the degradation of plastic materials? (A)Changes in temperature. (B)Ventilation in the museum. (C)Sound waves caused by noise. (D)Exposure to moisture and dust.

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.

48. According to the passage, which of the following may particularly accelerate the degradation of plastic materials?
(A)Changes in temperature.
(B)Ventilation in the museum.
(C)Sound waves caused by noise.
(D)Exposure to moisture and dust.

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