WHAT DOES THE PARAGRAPH FOLLOWING THE PASSAGE MOST PROBABLY DISCUS...

60. What does the paragraph following the passage most probably discuss?

A. How to recover your luggage

B. Where to go to continue your trip

C. When to return to the aircraft

D. How to proceed once you are away from the aircraft

Text 2.

In the very distant geological past all animals were aquatic. The very first vertebrates, or animals with

backbones, of which we have any fossil record, lived in the water. These vertebrates, the fish, were adapted to

underwater living. Their streamlined bodies were covered with scales to reduce surface friction: they had

muscular tails so that they could swim swiftly in such a dense medium as water; and they were endowed with

gills for breathing underwater.

Descendants of fish-type ancestors crossed the seashore barrier and accommodated themselves to life on

land. As amphibians, they possessed limbs instead of fins and lungs instead of gills. But they never became

completely free of the bonds that tied them to the water; even today many amphibians return to the water to

lay their eggs.

Millions of years after the first clumsy amphibians crawled over the land, newer types of land dwellers

appeared; these animals gave rise to the present-day reptiles and mammals. They were more completely

converted for land dwelling, with bodies and biological activities far different from those of fish. With these

special adaptations, mammals have been able to colonize the woods and meadows, the deserts and high

mountains, often far removed from the sea.