单项选择题

A．after
B．while
C．before
D．when
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单项选择题
A．gaveB．offeredC．sentD．took
A．gave
B．offered
C．sent
D．took
单项选择题
What eventually happens to the skin of the rattlesnake
A．The snake sheds its skin.
B．The skin becomes transparent.
C．The skin hardens and releases a poisonous liquid.
D．The snake forms an additional protective skin over the original.
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