单项选择题

The famous ______ Gold Rush began in the U. S. in the mid-nineteen century.

A．New York State
B．California
C．Pennsylvania
D．Texas
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单项选择题
Jose Martinez left the first company he worked for because it
[A] set the staff impossible targets.
B. offered insufficient financial rewards.
C. provided inadequate support.
D. offered staff few promotion opportunities.
单项选择题
The author points out that the Greeks who studied conic sections ______.
A. invented modem mathematical applications
B. were interested in navigation
C. were unaware of the value of their studies
D. worked with electricity
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