单项选择题

The underlined word "event" ( Paragraph 1 ) refers to______.

A．landslide
B．machine
C．earthquake
D．flood
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单项选择题
What does the robot look like
A．A human being.
B．A spider.
C．A truck.
D．A drill.
单项选择题
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
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