单项选择题

Living things can sense and ______ changes in their surroundings.

A．decide on
B．make up
C．lead to
D．respond to
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单项选择题
Sometimes, artists paint ______ for their own enjoyment or self-expression, choosing their own subjects.
A．primarily
B．occasionally
C．reluctantly
D．generously
单项选择题
Some persons ______ fishing simply for fun.
A．make
B．enjoy
C．seek
D．feel
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