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

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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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