用方框中所给短语的适当形式完成短文
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some
facts all their lives make friends with on their feet give birth to
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People already know a lot about animals. However, there are still some
things about animals that may surprise you. Here are {#blank#}1{#/blank#}about animals
you probably didn't know.
Cows
do have best friends and feel stressed when they are separated. Scientists have
found that cows are very social animals and that a cow always {#blank#}2{#/blank#}other
cows. When a cow is with its friends, it feels relaxed, compared with when it
is alone.
During a breeding season, a male penguin will offer a small stone to a
female penguin as a gift. If she takes it, they will become partners. When the
female penguin lays an egg, she and her partner may carry it {#blank#}3{#/blank#},
because some penguins don't build nests.
Crocodiles (鳄鱼) swallow (吞) stones. Crocodiles always
swallow their food instead of eating it like other animals. They swallow stones
which break the food into very small pieces in their stomachs. These stones may
stay in their stomachs {#blank#}4{#/blank#}.
Elephants use plants to treat pain or other illnesses. Scientists once
found a pregnant (怀孕的) elephant in Africa who ate a kind of plant which was not part of her
normal food. Four days later, she {#blank#}5{#/blank#}a baby elephant. The same plant was
used by the local pregnant women.
