单项选择题

Anything dropped falls towards the center of the earth because of ______.

A．weight
B．gravity
C．density
D．attraction
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单项选择题
The ______ of this meeting is to discuss ways of protecting the environment.
A．idea
B．function
C．reason
D．purpose
单项选择题
She didn't come to the party, though she ______ us she would.
A．offered
B．accepted
C．agreed
D．promised
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