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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单项选择题
What is the purpose in writing this text
A．Telling people how serious the damage caused by landslides is.
B．Telling people that sending workers to stabilize mountainsides is a risky job.
C．Introducing a product that can be used to stabilize mountainsides.
D．Showing people how to use a new product.
单项选择题
Why is it advised to buy a baby dog under three months old
A．It's easier to buy a baby dog under three months old.
B．They are less likely to be shy with human beings.
C．They are less likely to run away.
D．It's easier for them to form a relationship with their masters.
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