题目内容
The zebra belongs to the horse family.One of nature's great mysteries is why the zebra has stripes.One
theory is that the stripes help the zebra cool down.On hot days the black stripes get a lot hotter than the
white area of the zebra and under the black stripes there are special layers of fat for protection.Hot air then rises off the black stripes,forcing colder air down around the white areas,cooling the zebra down.This,
however,is just a theory.The stripes can also confuse predators (食肉动物) when zebras stay with other
animals in great numbers.
Zebras have excellent hearing and eyesight and can run at a speed of up to 35 miles per hour (56
kilometers per hour).They also have a powerful kick that can cause serious injury to a predator,like a
lion,or an African wild dog.Usually the lead male of the herd stays at the back of the group to defend
against predators if necessary,while the females and youngsters run from danger.
Zebras are herbivores and feed mostly on grasses,although they also might eat the leaves and stems (茎) of bushes a bit.They eat grasses for many hours each day,using their strong teeth.Spending so much
time chewing wears the zebra's teeth down,so their teeth keep growing all their lives.As the dry season
arrives and the grasses die back,zebra herds travel to find more food and water holes for drinking.Most
zebras have no specific territories.They travel from place to place,never staying in one area very long.
B. The black stripes help the zebra live through cold days.
C. The zebra can easily be attacked by predators.
D. The zebra always travels with other animals.
B. animals that only eat plants
C. animals that kill and eat other animals
D. animals that live in groups
B. are used all day
C. are always growing
D. are kept clean
B. Their stripes can confuse predators.
C. They can run 56 miles per hour.
D. They usually stay in one area all their lives.
B. Everyday Tips
C. Digital Stadium
D. Discoveries
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