单项选择题

A．It sends out signals for help.
B．It sounds an alarm to warn the driver.
C．It takes over the driving immediately.
D．It stops the car automatically.
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单项选择题
A．It helps a computer artist to record his pictures electronically.B．It helps a computer artist to send his pictures to others.C．It helps a computer artist to print pictures on paper.D．It helps a computer artist to connect his computer to the art museum.
A．It helps a computer artist to record his pictures electronically.
B．It helps a computer artist to send his pictures to others.
C．It helps a computer artist to print pictures on paper.
D．It helps a computer artist to connect his computer to the art museum.
单项选择题
A．To show that they have very different behaviors.B．To show that they send out different messages by their silent language.C．To show that they have nothing important to do.D．To show that they are not happier for being kept waiting.
A．To show that they have very different behaviors.
B．To show that they send out different messages by their silent language.
C．To show that they have nothing important to do.
D．To show that they are not happier for being kept waiting.
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