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