单项选择题

Two of the escaped prisoners are still _____________, so the police have offered a reward of＄5000 for arresting them.

A．at first
B．at large
C．at length
D．at random
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单项选择题
According to the first paragraph, plastics can be classified into _____________.
A．monomers and polymers
B．flexible plastics and inflexible plastics
C．thermoplastics and thermosetting plastics
D．natural plastics and synthetic plastics
单项选择题
The soldier found himself _____________ of a hero when he returned to his village.
A．somebody
B．something
C．anybody
D．anything
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