A pigment called melanin protects the______layers of skin from sun rays.

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问题 A pigment called melanin protects the______layers of skin from sun rays.

选项 A、under
B、below
C、underlying
D、underneath

答案C

解析 近义辨析。此题需辨清词性;本题空白处应填形容词,而选项;A.under作介词或副词;B.below作介词或副词;C underlying在下面的,下层的,为形容词;D.underneath作介词或副词;因此只有C正确。
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