单项选择题

A．The gravitational force.
B．The electromagnetic force.
C．The weak force.
D．The strong force.
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单项选择题
A．The dog is a lot of trouble.B．The dog is quite friendly.C．He doesn’t get along well with Debbie.D．He is glad Debbie gave him the dog.
A．The dog is a lot of trouble.
B．The dog is quite friendly.
C．He doesn’t get along well with Debbie.
D．He is glad Debbie gave him the dog.
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