According to the passage， the recent growth in air travel has meant that__________
举一反三
- According to the passage, air bags are another device that__________.
- According to the passage, the speeds at which a train must travel to qualify as “high-speed”______________.
- 智慧职教: Why has air travel become a common experience?
- The ______ of air travel during this century has made the world seem smaller.
- There has been a boom in economy in recent years. A: fall B: mistake C: growth D: flaw