阅读理解

B

   “How are frogs (青蛙) different from us?” the teacher asked. The class was happy to tell the teacher. The class knew that frogs are different from people. They knew that frogs are amphibians (两栖动物).

    Raina said, “I know we are different from frogs. We are not amphibians. We do not live in the water. But there is one frog that is different from other frogs. It is wood frog. This frog can freeze (冰冻). This frog can thaw (解冻). This frog can wake up from a frozen (冷冻的) sleep.”

  “How can a frog wake up from a frozen sleep?” asked the class. “How can a frog thaw? Are you sure this is a real frog?” “The frog is real! The frog lives in the USA and Canada. When it gets cold, the frog freezes,” said Raina.

  “Very few animals can survive freezing,”the teacher said. “Even you cannot survive being frozen. But the wood frog can. Now scientists are studying this kind of frog. They are studying how it freezes over the winter. They are studying how it thaws when the weather becomes warm. They are studying how it is different from other frogs.”

根据材料内容选择最佳答案。