Gorillas（大猩猩）like to sleep high in the trees. They build a new bed every night, sometimes taking up to half an hour to pile branches, twigs, and leaves into a comfor it safe to sleep in the trees, but unless they have eggs or young chicks, they don’t use a nest. They just lock their feet around a branch and hang on. A special tendon（腱）in their legs is automatically tight when they are at rest, so they won’t let go and fall.

　　   Dolphins(海豚) live underwater, but must come to the surface to breathe. Scientists now believe that dolphins may sleep with only half their brain, while the other half stays awake to keep them safe and breathing. Seals (海豹) also do this，lying on their sides on the surface of the water with one flipper(脚蹼)underwater paddling to keep their noses above the surface. Some ducks may also have this ability, and actually sleep with one eye closed and one eye open. 

　　68．How many animals are mentioned in this passage?

　　A．6.                       B．7.                       C．8.                       D．9.

　　69．How does a chameleon protect itself while sleeping

　　       A．By changing its body colors.            

　　B．By hinging out over a pond.

　　       C．By sleeping with half their brain.      

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