单项选择题

Even with detailed knowledge about an area, geologists cannot easily locate stores of underground natural gas.

A．varieties
B．maps
C．supplies
D．shops
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单项选择题
Before the Civil War,Frederick Douglass' editorials for the North Star urged respect for the rights of all people.
A．advocated
B．created
C．foresaw
D．granted
单项选择题
Your plan will call for a lot of money.
A．acquire
B．require
C．remind
D．degrade
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