单项选择题

Pure feldspar is a colorless,transparent mineral,but impurities commonly make it opaque and colorful.

A．truly
B．rapidly
C．periodically
D．frequently
<上一题 目录 下一题>
热门 试题

单项选择题
Cattle graze on the dry uplands of the island of Hawaii.
A．wander
B．breed
C．feed
D．exercise
单项选择题
His friend unexpectedly dropped in.
A．visited
B．stepped in
C．dropped off
D．met
相关试题