Passengers are not allowed to bring guns, knives, or other weapons onto a passenger airplane. Before boarding, they must walk through a detector which triggers a special signal if they are carrying anything made of metal. Luggage is also examined for weapons. This is done to ensure the safety of the passengers.

　　1. The main purpose of this passage is to introduce the history of airplanes.

　　2. The device of an automatic pilot can usually fly a plane more smoothly than a human pilot.

　　3. With the help of the radio equipment, pilots are able to communicate with ground controllers.

　　4. We can tell from the passage that early airplanes are not as solid as modern ones.

　　5. According to the passage, the busiest airport in the world is in Grapevine, Texas, midway between the cities of Dallas and Fort Worth.

　　6. The runways should be long and solid enough for the heavily loaded jets.

　　7. Precision Approach Radar is used by air traffic controllers to keep track of airplanes far away from the airport.

　　8. The planes can be landed fully automatically if the control towers are equipped with _________ .

　　9. After getting off the plane, every passenger arriving from another country must pass through____________ .

　　10. When passengers go through a detector before they board, and anything made of metal is detected, the detector triggers__________________.

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