单项选择题

Most insulation devices of this kind, （）manufactured for such purposes, are extremely expensive to install.

A. that are
B. which is
C. those are
D. as are

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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
The poetry of Ezra Pound is sometimes difficult to understand because it contains so many （）references.

A. obscure
B. acute
C. notable
D. objective
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