单项选择题

Regarded as a kind of art form, toys ______.

A．reflect the pace of social progress
B．also appeal greatly to adults
C．are not characterized by technological progress
D．follow a direct line of ascent

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单项选择题

The author uses the example of a rattle to show that ______.

A．in toy - making there is a continuity in the use of materials
B．it often takes a long time to introduce new technology into toy -making
C．even the simplest toys can reflect the progress of technology
D．even a simple toy can mirror the artistic tastes of the time