96- The phrase ``that idea'' in paragraph 2 refers to the idea ----------. - that pigeons can learn new things
- expressed by the psychologists mentioned in paragraph 2
- that recognizing facial expressions is important to human communication
- according to which to recognize facial expressions of emotion is not necessarily inborn
PASSAGE 2:For most modern airports, the major design problem is scale---how to allow enough space on the ground for maneuvering wide-body jets while permitting convenient and rapid movement of passengers departing, arriving, or transferring from one flight to another. Most designs for airport terminals take one of four approaches.
In the linear plan, the building may be straight or curved. The passengers board aircraft parked next to the terminal. This plan works well for small airports that need to provide boarding areas for only a few aircraft at a time.
In the pier plan, narrow corridors or piers extend from a central building. This plan allows many aircraft to park next to the building. However, it creates long walking distances for passengers.
In the satellite plan, passengers board aircraft from small terminals that are separated from the main terminals. Passengers reach the satellites by way of shuttle trains or underground passageways that have moving sidewalks.