单项选择题

Passage One Questions 11 to 14 are based on the passage you have just heard.

A．Washing plates.
B．Cleaning tables.
C．Shining shoes.
D．Sweeping the floor.
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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
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
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