【C1】______ snakes, lizards, and crocodiles, turtles belong to the class of

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问题    【C1】______ snakes, lizards, and crocodiles, turtles belong to the class of animals called reptiles. The earliest fossils recognized【C2】______ turtles are about 200 million years old and【C3】______ the time when dinosaurs roamed the Earth. Turtles have changed little in appearance【C4】______  that time.
   About 250【C5】______  of turtle are found throughout the temperate and tropical regions of the world, including the major seas.【C6】______  other reptiles, whose populations are【C7】______  largely to the tropics, turtles are most abundant in southeastern North America and southeastern Asia. They live in lakes, ponds, salt marshes, rivers, forests, and even deserts. The size of turtles【C8】______  Bog or mud turtles grow 【C9】______ about 4 inches long. The sea-roving leatherback turtle, however, may be more than 6.5 feet【C10】______  length and weigh more than 1, 100 pounds. Alligator snappers of the southeastern United States reach weights of more than 110 pounds. They are among the largest freshwater turtles. Land-dwelling species are often called tortoises. In the United States some【C11】______  turtles are called terrapins.
   Turtles have protective shells. The【C12】______  arched part is called the carapace; the【C13】______  bottom part is the plastron. Some species, such as the box turtle, can【C14】______ the head, legs, and tail and tightly close the hinged front and back halves of the plastron for【C15】______ The snapping turtle,【C16】______  , has a small plastron that does not cover its underside. Powerful jaws and claws are the snapping turtle’s best defense【C17】______  enemies. Sea turtles also are【C18】______  to retreat completely inside their shells. Side-necked turtles have necks that are too【C19】______  to tuck into their shells.【C20】______ , the neck folds sideways along the inner edge. [br] 【C11】

选项 A、editable
B、edible
C、potable
D、portable

答案 B

解析本题区分了几个形近词的意义。选项A editable意思为“可以编辑的”，选项C potable表示“适于饮用的”，选项D．portable表示“轻便的、手提的”，选项B．edible表示“可吃的”。从上下文可以判断，本句涉及到与吃有关的词，所以选项B为本题的正确答案。

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