单选题
Decide which of the choices given below would best complete
the passage if inserted in the corresponding blanks. Mark the best choice for
each blank on your answer sheet. {{U}} {{U}} 1 {{/U}}
{{/U}}snakes, lizards, and crocodiles, turtles belong to the class of animals
called reptiles. The earliest fossils recognized {{U}} {{U}} 2
{{/U}} {{/U}}turtles are about 200 million years old and {{U}} {{U}}
3 {{/U}} {{/U}}the time when dinosaurs roamed the Earth. Turtles have
changed little in appearance {{U}} {{U}} 4 {{/U}} {{/U}}that
time. About 250 {{U}} {{U}} 5 {{/U}} {{/U}}of
turtle are found throughout the temperate and tropical regions of the world,
including the major seas. {{U}} {{U}} 6 {{/U}} {{/U}}other
reptiles, whose populations are {{U}} {{U}} 7 {{/U}}
{{/U}}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 {{U}} {{U}} 8
{{/U}} {{/U}}Bog or mud turtles grow {{U}} {{U}} 9 {{/U}}
{{/U}}about 4 inches long. The sea-roving leatherback turtle, however, may be more
than 6.5 feet {{U}} {{U}} 10 {{/U}} {{/U}}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
{{U}} {{U}} 11 {{/U}} {{/U}}turtles are called
terrapins. Turtles have protective shells. The {{U}}
{{U}} 12 {{/U}} {{/U}}arched part is called the carapace; the
{{U}} {{U}} 13 {{/U}} {{/U}}bottom part is the plastron. Some
species, such as the box turtle, can {{U}} {{U}} 14 {{/U}}
{{/U}}the head, legs, and tail and tightly close the hinged front and back halves
of the plastron for {{U}} {{U}} 15 {{/U}} {{/U}}The snapping
turtle, {{U}} {{U}} 16 {{/U}} {{/U}}, has a small plastron that
does not cover its underside. Powerful jaws and claws are the snapping turtle's
best defense {{U}} {{U}} 17 {{/U}} {{/U}}enemies. Sea turtles
also are {{U}} {{U}} 18 {{/U}} {{/U}}to retreat completely
inside their shells. Side-necked turtles have necks that are too {{U}}
{{U}} 19 {{/U}} {{/U}}to tuck into their shells. {{U}} {{U}}
20 {{/U}} {{/U}}, the neck folds sideways along the inner edge.
单选题
A. Except for
B. Except
C. Along with
D. Including
【正确答案】
C
【答案解析】[解析] 本句的意思是：海龟和蛇、蜥蜴、鳄鱼一样，都属于爬行动物。本题的四个选项中，选项B except意思是“除了…之外”，表示排除，选项A Except for也表示排除，选项D including表示包含关系，只有选项C Along with意思是“和…一起”，表示并列。
【答案解析】[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。
单选题
A. at
B. since
C. from
D. in
【正确答案】
B
【答案解析】[解析] 本题区分的是几个引导时间状语的词。At that time表示是“在那时”，from that time表示的是“从那时起”，这两个时间状语通常与过去时态连接。In that time是个错误的搭配。Since that time表示“从那时开始”，常与完成时态搭配，所以为本题的正确答案。
【答案解析】[解析] 本题考查的是可以用于修饰长度的形容词。那么首先可以排除的是选项C no more than。从上下文的意思判断，本文暗含的意思是四英寸的海龟很小，那么选项A no shorter than 和选项B．no smaller than都可以排除，只有选项D no larger than意思相当于only，为本题的正确答案。