单项选择题

Questions 19 to 21 are based on the passage you have just heard.

A. It is expected to be a $3 billion industry.
B. It is expected to be a $13 billion industry.
C. It is expected to be a $1.13 billion industry.
D. It is expected to be a $1.3 billion industry.
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单项选择题
C
单项选择题
A. It will stop automatically.B. It will move on at the same speed.C. It will gradually slow down.D. It will keep a safe distance from the other trains.
A. It will stop automatically.
B. It will move on at the same speed.
C. It will gradually slow down.
D. It will keep a safe distance from the other trains.
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