綜合類A級模擬題：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(鰭狀肢)，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 (節). 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(使彎曲)in the same way. Sperm whales(抹香鯨)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(章魚).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
參考答案：B C A D B C A D A B C D B A D
答案解析：
1.答案為B.第一段講到鯨魚很像陸地上的哺乳動物，最后一句舉了一些例子來說明這一點。 sign的意思是“符號，特征”，鯨魚具有陸地上哺乳動物的一些特征，故選B.
2.答案為C.something is built into…的意思是“把……裝(建、插)入……”，這里指鯨魚生有 巨大的氣力。其他幾個選項意思上講不通。
3.答案為A.只能用介詞at，不能用其他介詞。
4.答案為D.rate表示“速度”，從上下文來講，選D意思才講得通。
5.答案為B.此題亦必須根據上下文的意思來推測選哪個詞。鯨魚被惹怒后會攻擊船只，所以選B.
6.答案為C.這里是一非限定性定語從句，關系代詞作 主語，用which，故選C.
7.答案為A.have something 過去分詞是一固定結構，此處只能選A.
8.答案為D.本題所在句子為該段主題句，談的是鯨魚的潛水能力。鯨魚的潛水能力很強，能下潛到很深的地方，科學家們不解，所以說是個迷，故選D.
9.答案為A.雖然本題的幾個選項都能與food搭配，但從上下文意思來講，只有A正確。
10.答案為B.空格后面的名詞是pound，重量單位，據此可以判斷選B，因為其他幾個選項不能和pound搭配。
11.答案為C.呆在水下要用動詞remain，其他幾個動詞放入空格處意思講不通。
12.答案為D.此題也必須在讀懂上下文意思的基礎上才能作出判斷，這里指鯨魚聚集氧氣，故選D.
13.答案為B.上文談到鯨魚為什么能夠在水下承受巨大的壓力，科學家們還沒有找到答案。 選項中的deterrmine的意思是“確定”，此詞放入空格處意思講得通，其他幾個選項講不通，故選B.
14.答案為A.special雖然和幾個選項都能搭配使用，但只有選項A意思上講得通，故A為正確答案。
15.答案為D.此題亦需根據上下文的意思作出判斷。automatically的意思是“自動地”。