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1. The U.S. Air Force used airships throughout the 1970s.
The correct answer: | False |
2. Goodrich has used airships for many years to cover sporting events.
The correct answer: | True |
3. In l989, the Soviet Union began working on a diskshaped airship capable of lifting several hundred tons.
The correct answer: | True |
4. Economic and environmental concerns may help bring back the airship.
The correct answer: | True |
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