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阅读短文及文后A～E选项，选出可以填入各题空白处的最佳选项。
People already know a lot about animals. However, there are still some things about animals that may surprise you.
Cows do have best friends and feel stressed when they are separated. Scientists have found that cows are very social animals and a cow always makes friends with other cows.
During breeding season, a male penguin (企鹅) will offer a small stone to a female penguin as a gift.When the female penguin lays an egg, she and her partner may carry it on their feet, 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.
Elephants use plants to treat pain or other illness. 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.The same plant was used by the local pregnant women.
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A. If she takes it, they will become partners.
B. These stones may stay in their stomachs all their lives.
C. When a cow is with its friends, it feels relaxed, compared with when it is alone.
D. Four days later, she gave birth to a baby elephant.
E. Here are some facts about animals you probably don't know.
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