单项选择题

By doing the "tank test", the engineers can find out ______.

A．the amount of air in the plane
B．the strength of the plane structure
C．the pressure inside and outside the plane
D．the power of the airplane engines

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单项选择题

What might be the most suitable title for the text

A．Two Important Tests on Airplanes.
B．The Importance of Flying Safely.
C．The Danger of Testing Airplanes.
D．How Airplanes Are Made and Tested.

单项选择题

What will happen to the plane under the tank test

A．It will be broken.
B．It will be made stronger.
C．It will be filled with water.
D．It will be tested by pilots.