填空题 You will hear a long talk. As you listen, answer the questions or complete the notes in your test booklet for Questions 21 to 30 by writing no more than three words in the space provided on the right. You will hear the talk twice.

填空题 Pilots need many gauges and ______ to help fly modern airplanes.

填空题 Which can tell the pilot how high the plane is off the ground?

填空题 What can the autopilots control besides flying the plane?

填空题 What were the early airplanes made of?

填空题 The designers would test ______ in wind tunnels before the full sized planes are built.

填空题 All the traffic is carefully controlled to avoid delays and accidents from ______.

填空题 How many hectares does the airport in Grapevine cover?

填空题 The runways must be made of ______ when the planes land.

填空题 Runways at some large airports are longer than ______.

填空题 What system is set up beyond the runway in order to help land safely?