2. 外语
  3. Tanning by the sun takes place because sunlight stimulates the skin to produce the pigment melanin.

Tanning by the sun takes place because sunlight stimulates the skin to produce the pigment melanin.

admin2010-01-13  67
问题 Tanning by the sun takes place because sunlight stimulates the skin to produce the pigment melanin.
选项 A、burning
B、roasting
C、browning
D、scorching
答案C
解析
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