ACCORDING TO THE PASSAGE, WHAT DO SCIENTISTS BELIEVE ABOUT THE GASE...

35.According to the passage, what do scientists believe about the gases found in the moon

rocks?

A.The gases came to the moon from the sun.

B.The gases were created inside the rocks.

C.The streams of gases went to the sun.

D.The emission of the gases caused the moon’s temperature to rise.

ZOOS – THEN AND NOW

Modem zoos are very different from zoos that were built fifty years ago. At that time, zoos

were places where people could go to see animals from the parts of the world. The animals

lived in cages that were made of concrete with iron bars, cages that were easy to keep

clean. Unfortunately for the animals, the cages were small and impossible to hide in. The

zoo environment was anything but natural. Although the zookeepers took good care of the

animals and fed them well, many of the animals did not thrive; they behaved in strange

ways, and they often became ill.

In modem zoos, people can see animals in more natural habitats. The animals are given

more freedom in large areas so that they live more as they would in nature. Even the

appearance of zoos has changed. Trees and grass grow in the cages, and the streams of

water flow through the areas that the animals live in. There are few bars; instead, there is

often only a deep ditch, filled with water, which is called a moat. The moat surrounds an

area where several species of animals live together as they would naturally. For example,

in the San Diego Zoo, the visitors can walk through a huge special cage that is filled with

trees, some small animals, and many birds. This particular kind of cage is called an aviary;

it is large enough that the birds can live naturally. The birds in the aviary fly around, make

nests in the trees, and hunt for food. At the Zoological Park in New York City, because of

special night lights, people can observe nocturnal animals that most people have never

seen; these animals are active only at night, when most zoos are closed. In a zoo like the

Arizona-Sonora Desert Museum, people can see animals that live in the special

environments like the desert. Some other zoos have special places for visitors to watch

animals that live under water like fish. Still other zoos have special places for animals that

live in cold polar surroundings like the great white bear from the Arctic region.

Modem zoos not only display animals for visitors, but they also preserve and save

endangered species. Endangered animals such as the American bald eagle and bison are

now living and producing offspring in zoos. For this reason, fifty years from now the

grandchildren of today’s visitors will still be able to enjoy watching these animals.