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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.

单项选择题A．She hadn’t heard about it.B．She’s not enthusiastic about it.C．She’s curious to know how it works.D．She hopes it has more than 500 channels.

A．She hadn’t heard about it.
B．She’s not enthusiastic about it.
C．She’s curious to know how it works.
D．She hopes it has more than 500 channels.