单选题

With which of the following statements about geologic mapping would the author be most likely to agree?

A、 Geologic mapping is basically an art and not a science.
B、 Geologic mapping has not changed significantly since the early 1960's.
C、 Geologic mapping will have limited practical applications until remote-sensing systems are perfected.
D、 A developmental milestone in geologic mapping was reached in 1972.
E、 Without the present variety of remote-sensing techniques, geologic mapping could not be done

【正确答案】 D

【答案解析】