单选题
The biggest advantage of this product is that ______.
A、
it will be faster and cheaper than manual labor
B、
it can climb mountainsides, drill holes, insert bars and cement
C、
it can collect data on the slope' s stability
D、
it can drill without a human being on board
【正确答案】
D
【答案解析】
[解析] 细节判断题。从第二段The idea is to operate a machine far away that can drill without a human being on board一句以及第一段讲滑坡人工抢险的危险，可知这种产品的最大优点就是无人操作的安全性。
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