单项选择题

A big problem in learning English as a foreign language is a lack of opportunities for ______ interaction with proficient speakers of English.

A．instantaneous
B．provocative
C．verbal
D．dual
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单项选择题
To be an inventor, one needs profound knowledge as well as a very ______ imagination.
A．vivid
B．bright
C．living
D．funny
单项选择题
Some researchers feel that certain people have ______ nervous systems, particularly to hot, dry winds. They are what we call weather-sensitive people.
A．subjective
B．subordinate
C．liable
D．vulnerable
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