单选题
According to the passage thermal cameras ______.
A、
have yet to be put to general use
B、
have proved successful since 2 years ago
C、
have to undergo tests at least half a year
D、
have been playing a dominant role in lie detection
【正确答案】
A
【答案解析】
由The prototype, ……is at least 2 years from being ready for general use可知正确答案是A(还没有被普遍应用)。
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