单项选择题

His parents were once well-off but they lost all their money.

A．in good health
B．not happy
C．well-to-do
D．not rich
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单项选择题
When hummingbirds fly, their wingbeats are so rapid that the wings seem blurred.
A．tiny
B．fragile
C．indistinct
D．inexhaustible
单项选择题
Bone and ivory are light, strong, and accessible materials for Inuit artists.
A．distinctive
B．economical
C．available
D．optional
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