大学英语阅读教程Reading 4(7)

in fact They come from the same biological family.

Similarities The shape of an elephant’s head is similar to a

whale’s

Another similarities both animals are excellent swimmers

Like They use sounds to show anger.

Finally both female elephants and female whales stay close to other

females and help them when they give birth.

2

Main Idea：People usually build their houses out of the materials that are easily available to them.

Does this paragraph include similarities，differences，or both？ Differences Signal Words Details

Other areas of Europe They build their houses of stone and brick.

In tropical regions houses are made from plants that grow there. Coldest area people made their houses out of blocks of ice.

Exercise 10

Exercise 11

A

AIDS HIV

Epidemics bacteria

Coughs colds and flu

Improperly stored food food poisoning

Slow infant development poor nutrition

Skin cancer too much exposure to the sun Swimming in pools ear infection

Heart trouble diet high in fat

Lung cancer cigarette smoking

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