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
The reception was attended by various ______ members of the local community and representatives of regional industries.
A. protuberant
B. conspicuous
C. prominent
D. projecting
单项选择题
Horseback riding （）both the skill of handling a horse and the mastery of diverse riding styles.

A. embraces
B. encourages
C. exaggerates
D. elaborate
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