单项选择题

A．It increased the students’’ blood pressure.
B．It increased some students’’ energy level.
C．It released a natural painkiller in some students’’ bodies.
D．It improved the students’’ ability to play musical instrument s.
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establishing
单项选择题
A．To show the key role played by air traffic controllers.B．To show the great responsibility shouldered by the pilots.C．To give an example of air disasters.D．To show that air travel is far safer than driving a car.
A．To show the key role played by air traffic controllers.
B．To show the great responsibility shouldered by the pilots.
C．To give an example of air disasters.
D．To show that air travel is far safer than driving a car.
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