单项选择题

For your safety, the electrical appliance can only operate when it has been correctly mounted on a dry and cool base.

A．你只有在干燥通风的地方操作这台电子仪器才安稳。
B．只有在干燥通风的场所才能使电子仪器持续运转。
C．为了安全起见，本电器设备只有安装在通风阴凉处才能确保其正常运行。
D．为了安全起见，本电器设备只有安装在通风阴凉的基座上才能运行。
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单项选择题
Sometimes patrolling officers on buses are unnoticed because（）

A. they look like fare inspectors
B. they don’t wear uniform
C. they are polite to passengers
D. they often take a back seat
单项选择题
An international flight passenger should check in at least（）

A. 20 minutes before departure
B. 30 minutes before departure
C. 45 minutes before departure
D. 60 minutes before departure
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