单项选择题

According to the passage, many people initially thought that E. L. Drake had made a mistake by ______.

A．going on a whaling expedition
B．moving to Pennsylvania
C．searching for oil
D．retiring from his job
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单项选择题
What does the term behavior in the second paragraph especially refer to in this passage
A．It refers to observable and physical movements and acts.
B．It refers to the part of language behavior that involves understanding or interpretation.
C．If refers to both the overt and the unobservable language behaviors in communicating.
D．If refers to acts of speaking and writing.
单项选择题
What does internal mechanism (Line 3, Para 3) mean
A．Secret machine.
B．Mental processes.
C．Over system.
D．Mechanic operation.
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