单项选择题

People sometimes succeed in timely avoiding danger because______.

A．they have gained experience
B．they jump out of the way in time
C．they are calm in face of danger
D．they are warned of the danger and can take quick action

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单项选择题

The passage is mainly about______.

A．a new regulation for all airlines
B．the defects of electronic devices
C．a possible cause of aircraft crashes
D．effective safety measures for air flight

单项选择题

The teaching of reading will be successful if______.

A．teachers can improve conditions at school for the students
B．teachers can enable students to develop their own way of reading
C．teachers can devise the most efficient system for reading
D．teachers can make their teaching activities observable