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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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

单项选择题

_____________ in his life, he became the proud owner of a bed which had springs and a mattress.

A．For the first time
B．From time to time
C．For the time being
D．All the time