单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．Make a donation to support the group.
B．Help the man organize the rally.
C．Sign a petition.
D．Take advantage of the student parking lot.
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单项选择题
A．He helped a man get across the rails.B．He stopped a man from destroying the rails.C．He protected two little girls from getting hurt.D．He saved a person without considering his own safety.
A．He helped a man get across the rails.
B．He stopped a man from destroying the rails.
C．He protected two little girls from getting hurt.
D．He saved a person without considering his own safety.
单项选择题
Ralf Herrtwich compares car radio networking to ______.
A．an online community
B．an extra sensor
C．a relay race
D．a better driver
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