单项选择题

A．The bacteria would be killed by the human immune system.
B．The bacteria would die if brought to the surface.
C．Many antidotes and remedies are available.
D．Drilling operations are always closely monitored.
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单项选择题
A．The amount of skin affected by the cut.B．The cause of the cut.C．The amount of bleeding.D．The number of nerve endings irritated.
A．The amount of skin affected by the cut.
B．The cause of the cut.
C．The amount of bleeding.
D．The number of nerve endings irritated.
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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