【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] 【C3】

选项 A、track to
B、trace to
C、date from
D、track down

答案 C

解析本题区分的是几个意义相近的词组。选项A track to表示“追踪到”，选项B trace to表示“有起源，可以追溯的”，选项D track down意思是“追捕、追踪”，选项C date from表示“追溯到…”，常表示的是时间，所以为本题的正确选项。

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