When the weather ___45___ warm, sea turtles leave the ocean to___46___ their eggs on the beach. This is the only time they will ever leave the water. Most___47____ turtles spend part of the time in water___48___ part of the time on land. It is easy to understand___49____ sea turtles stay in the water. Their___50___ to swim is greater than their ability to walk. Their heavy bodies and unusual feet make it hard for them to ___51___ on land. They are better___52___ for life in the water. They are well suited for life in the sea because of__53___ their bodies are made.

　　The way their feet are made helps sea turtles swim very quickly. Their feet look like long __54___. When they swim, they flap their feet like a bird flaps its wings. This ___55___ way of swimming benefits sea turtles. It allows them to escape from their enemies.

　　61．A.dwarfs

　　B.giants

　　C.mammals

　　D.ancestors

　　62．A.measure

　　B.weigh

　　C.sell

　　D.sound

　　63．A.grow up

　　B.bring up

　　C.take up

　　D.go up

　　64．A.suit

　　B.fit

　　C.match

　　D.seize

　　65．A.go to

　　B.turn to

　　C.back to

　　D.return to

　　66．A.keep up with

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