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
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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
单项选择题
If they think they are going to win over us by obstinately ______ and refusing to make the slightest concession, they are mistaken.
A．holding out
B．holding to
C．holding over
D．holding up
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