单项选择题

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

A．burning
B．roasting
C．browning
D．scorching
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单项选择题
Some children display an unquenchable curiosity about every new thing they encounter.
A．insatiable
B．inherent
C．indiscriminate
D．incredible
单项选择题
Would you bring me some up-to-date catalogues
A．current
B．well-documented
C．lavish
D．hostile
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