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．David had difficulty in getting tickets.B．David has gone to the exhibit.C．David tried to get tickets after work.D．David will go to work the day after tomorrow.
A．David had difficulty in getting tickets.
B．David has gone to the exhibit.
C．David tried to get tickets after work.
D．David will go to work the day after tomorrow.
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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