28．What is mainly described in the passage?

A．A historic discovery. B．An event of imagination.

C．A research on space. D．A scientific adventure.

29．When the first piece hits the South Atlantic, it causes .

A．an earthquake B．damages to cities

C．an Earth explosion D．huge waves

30．Why can't the northern half of the earth escape for long?

A．Because the land is covered with water

B．Because the light and heat from the sun can not reach the earth.

C．Because people there can not live at the temperature of zero.

D．Because wars break out among countries .

31．By giving the example of dinosaurs, the author tries to prove .

A．animals could not live in the cold climate

B．what happened 65 million years ago was an invented story

C．the human beings will die out in 2094

D．the Earth could be hit by other objects in space

D

　The coyote (丛林狼), that clever animal of wide-open spaces, has come to the nation's capital. In fact, coyotes have spread to every corner of the United States, changing their behaviors to fit new environments and causing researchers to deal with a troublesome new kind of creature: the city coyote.

The coyote originally lived in the middle of the continent. One of its most obvious characters is its smartness, which has made the animal a notorious (臭名昭著的) pest. Hunters trapped, shot and poisoned more than a million coyotes in the 1900s. It's still one of America's most hunted animals. Yet the coyote has survived. How has the coyote shown this extraordinary ability? "I guess if you wanted to use one word, it'd be 'plasticity'," says Eric Gese, an expert at Utah State University. Coyotes can live alone, in pairs, or in large packs like wolves; hunt at night or during the day; occupy a small region or an area up to 40 square miles; and live on all sorts