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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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
单项选择题
In mountainous regions, much of the snow that falls is compacted into ice.
A．hauled
B．compressed
C．compiled
D．harnessed
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