These clues suggest the animals don’t need oxygen, but the evidence(证据) is indirect, which means that scientists still have not observed how the animals live without oxygen. This means more studies are needed, but the scientists think they’re on the right track. And if they’re right, biologists will need to rethink what they know about where animals live.

　　What excited the scientists most is that______.

　　A.they found three animal species visit the salty water under the Mediterranean Sea

　　B.single-celled animals can live in super-salty waters

　　C.the tiny animals have many cells

　　D.three kinds of animals can live in places that have no oxygen

　　The underlined phrase in Paragraph 2 means the scientists could think _____.

　　A.only single-celled creatures don’t need oxygen to live

　　B.multicellular animals can visit the super-salty waters

　　C.the newly found creatures can’t live in the super-salty waters

　　D.multicellular animals also can live without oxygen besides single-celled ones

　　Which of the following CAN’T be used to prove the newly found creatures can live in super-salty waters?

　　A.Their dead bodies are found there.

　　B.Some in the samples have eggs.

　　C.Some old skins are found in the samples.

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