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
All the finished products are stored in a ______ at the delivery port and shipping is available at any time.
A．garage
B．capsule
C．cabinet
D．warehouse
单项选择题
In the experiment we kept a watchful eye ______ the developments and recorded every detail.
A．in
B．at
C．for
D．on
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