单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．15.
B．135.
C．50.
D．150.
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单项选择题
A．routineB．principleC．habitD．rule
A．routine
B．principle
C．habit
D．rule
单项选择题
What does the author mainly discuss in this passage
A．How to avoid car crash.
B．How to educate children properly.
C．How to design safer baby equipment.
D．How to properly secure children in the car.
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