综合类A级模拟题：完形填空The Greatest Mystery
The whale is a warm-blooded，air-breathing animal，giving birth to its young alive，sucking them--and，like all mammals，originated on land.There are many front flippers(鳍状肢)，used for steering and stability， are traces of feet.______(1)of this.Its Immense strength is______(2)into the great body of the big whales，and in fact most of a whale’s body is one gigantic muscle.The blue whale’s pulling strength has been estimated ______(3)400 horsepower.One specimen was reported to have towed(拖)a whaling vessel for seven hours at the______ (4) of eight knot (节). An angry whale will ______ (5) A famous example of this was the fate of Whaler Essex， ______ (6)was sunk off the coast of South America early in the last century.
More recently， steel ships have ______(7)their plates buckled(使弯曲)in the same way. Sperm whales(抹香鲸)were known to seize the old-time whaleboats in their jaws and crush Them. The greatest ______ (8)of whales is their diving ability.The sperm whale dives to the Bottom for his______ (9)food，the octopus(章鱼).In that search he is known to go as far Down as 3，200 feet， where the.______ (10)is 1，400 pounds，to a square inch.Doing so he Will ______ (11)underwater long as one hour.Two special skills are involved in this storing up enough______ (12)(all whales are air—breathed)and tolerating the great change in pressure.Just how he does it scientists have not ______(13).It is believed that some of the oxygen is stored in a special______ (14)of blood vessels，rather than just held in the lungs.And it is believed that a special kind of oil in his head is some sort of compensating mechanism that ______ (15)adjusts the internal pressure of his body.But since you can’t bring a live whale into the laboratory for study， no one knows just how these things work.
1 A aspects B signs C ways D reasons
2 A worked B divided C built D moved
3 A at B in C of D with
4 A number B degree C distance D rate
5 A abandon B attack C leave D board
6 A as B who C which D that
7 A had B operated C Seen D caught
8 A interest B job C danger D mystery
9 A favorite B fast C new D sufficient
10 A depth B pressure C level D size11 A set B become C remain D rest
12 A heat B energy C food D oxygen
13 A witnessed B determined C applied D calculated
14 A system B place C arrangement D equipment
15 A mentally B artificially C manually D automatically
参考答案：B C A D B C A D A B C D B A D
答案解析：
1.答案为B.第一段讲到鲸鱼很像陆地上的哺乳动物，最后一句举了一些例子来说明这一点。 sign的意思是“符号，特征”，鲸鱼具有陆地上哺乳动物的一些特征，故选B.
2.答案为C.something is built into…的意思是“把……装(建、插)入……”，这里指鲸鱼生有 巨大的气力。其他几个选项意思上讲不通。
3.答案为A.只能用介词at，不能用其他介词。
4.答案为D.rate表示“速度”，从上下文来讲，选D意思才讲得通。
5.答案为B.此题亦必须根据上下文的意思来推测选哪个词。鲸鱼被惹怒后会攻击船只，所以选B.
6.答案为C.这里是一非限定性定语从句，关系代词作 主语，用which，故选C.
7.答案为A.have something 过去分词是一固定结构，此处只能选A.
8.答案为D.本题所在句子为该段主题句，谈的是鲸鱼的潜水能力。鲸鱼的潜水能力很强，能下潜到很深的地方，科学家们不解，所以说是个迷，故选D.
9.答案为A.虽然本题的几个选项都能与food搭配，但从上下文意思来讲，只有A正确。
10.答案为B.空格后面的名词是pound，重量单位，据此可以判断选B，因为其他几个选项不能和pound搭配。
11.答案为C.呆在水下要用动词remain，其他几个动词放入空格处意思讲不通。
12.答案为D.此题也必须在读懂上下文意思的基础上才能作出判断，这里指鲸鱼聚集氧气，故选D.
13.答案为B.上文谈到鲸鱼为什么能够在水下承受巨大的压力，科学家们还没有找到答案。 选项中的deterrmine的意思是“确定”，此词放入空格处意思讲得通，其他几个选项讲不通，故选B.
14.答案为A.special虽然和几个选项都能搭配使用，但只有选项A意思上讲得通，故A为正确答案。
15.答案为D.此题亦需根据上下文的意思作出判断。automatically的意思是“自动地”。