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
Machine tools vary in size from handheld devices used for drilling and grinding to large stationary machines that perform a number of different operations.
A．exist
B．expand
C．compare
D．range
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