Genetially modified ______plants have genes from a fish.
A. corn
B. tomato
C. strawberry
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Boarding usually happens _____ minutes before scheduled departure.
A. 30
B. 60
C. 90
D. 120
About two hours prior to takeoff, the gate attendant will announce the boarding time.
A. 对
B. 错
Most hallways are long.
A. 对
B. 错
Boarding usually happens _____ minutes before scheduled departure.
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