单项选择题

In general, children’s holophrastic sentences begin______.

A. in the late part of the first year or the early part of the second year
B. in the second half of the second year
C. between two and three years old
D. between four and five years old

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单项选择题

The purpose of this passage is______.

A．to explain why people fail to act in emergencies
B．to explain when people will act in emergencies
C．to explain what people will do in emergencies
D．to explain how people feel in emergencies

单项选择题

What is the main idea of the forth paragraph

A．Impact of robots.
B．Relationship between robots and jobs.
C．Robotic manipulators.
D．Damages of robots.