单项选择题

When an organism is completely encapsulated and preserved, it becomes a fossil, therefore turning into evidence of things that once lived（）.

A．thereby
B．as a result of
C．so
D．in the end

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单项选择题
His heavy drinking and fond of gambling makes him a poor role model（）.

A．and fact that he gambles
B．and that he gambles
C．and he gambles which
D．and gambling
单项选择题
Don''t set him to talking philosophy or he''ll go on all evening（）.

A．off
B．on
C．at
D．of
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