单项选择题

The passage would be most likely to appear in a______.

A．petrological research report focused on the history of temperature-depth records in the United States
B．congressional report urging the conservation of oil and natural gas reserves in the United States
C．technical journal article concerned with tile recoverability of remaining coal resources
D．consumer report describing the extent and accessibility of remaining coal resources
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单项选择题
It can be inferred from the passage that the availability of temperature-depth records forany specific area in the United States depends primarily on the______.
A．possibility that HDR's may be found in that area
B．existence of previous attempts to obtain oil or gas in that area
C．history of successful hot water or steam recovery efforts in that area
D．failure of inhabitants to conserve oil or gas reserves in that area
单项选择题
The primary purpose of the passage is to______.
A．alert readers to the existence of HDR's as an available energy source
B．document the challenges that have been surmounted in the effort to recover energy from HDR's
C．warn the users of coal and oil that HDR's are not an economically feasible alternative
D．encourage the use of new techniques for the recovery of energy from underground hot water and steam
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