单项选择题

A．restrained
B．retained
C．reserved
D．restricted
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单项选择题
What does this speaker mainly talk about
A．Two important tests of a new airliner before it is put into use.
B．How to carry out tank test in the water.
C．How pilots carry out the test flights.
D．How to make a safe passenger plane.
单项选择题
Where is the second test carried out
A．In the air.
B．On the airfield.
C．Under water.
D．At the plane manufacturing factory.
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