单选题
The passage suggests which of the following about the "conventional methods" mentioned in line 29?
A、
They consist primarily of field surveys and laboratory measurements.
B、
They are not useful in providing information necessary for reconstructing geologic evolution
C、
They have rarely been used by geologists since 1972.
D、
They are used primarily to gather compositional information about geologic features.
E、
They are limited primarily because of difficulties involved in interpreting film images.
【正确答案】
A
【答案解析】
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