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
He was so______on his work that he didn t hear her come in.
A．intent
B．absorbed
C．engrossed
D．involved
单项选择题
According to the passage, which of the following memories has nothing to do with implicit memory
A．Associating a signal with an action.
B．Recognizing of new features.
C．Focusing on new environment.
D．Remembering a familiar face of a friend.
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