【单选题】
下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。
The whale is a mammal (哺乳动物) - warm-blooded, air-breathing, giving birth to its young alive, sucking them - and, like all mammals, originated on lanD、There are many signs of this. {{U}} (51) {{/U}} front flippers (鳍肢), used for steering and stability, are traces of feet.
Immense strength is built 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 {{U}} (52) {{/U}} has been estimated at 400 horsepower. One specimen was reported to have {{U}} (53) {{/U}} a whaling vessel for seven hours at the {{U}} (54) {{/U}} of eight knots.
An enraged whale will attack a ship.A、famous {{U}} (55) {{/U}} of this was the fate of whalerEssex, which was sunk {{U}} (56) {{/U}} the coast of SouthAmerica early in the last century. More recently, steel ships have had their plates buckled (扭曲变形)in the same way. Sperm whales were known to {{U}} (57) {{/U}} the old-time whaleboats in their jaws and crush them.
The greatest mystery of whales is their diving ability. The sperm whale can {{U}} (58) {{/U}} the bottom for his favorite food, the octopus (章鱼). {{U}} (59) {{/U}} that search he is known to go as far down as 3,200 feet, where the pressure is 1,400 pounds, to the square inch.Doing {{U}} (60) {{/U}} he will remain submerged (水下的) as long as one hour. Two feats (绝技) are involved in this: storing up enough {{U}} (61) {{/U}} (all whales are air-breathed) and withstanding the great change in pressure. Just {{U}} (62) {{/U}} he does it scientists have not determineD、It is believed that some of the oxygen is stored in a special system of blood vessels, rather than just held in the lungs.And {{U}} (63) {{/U}} is believed that a special kind of oil in his head is some sort of compensating mechanism that automatically adjusts the internal pressure of his body.But {{U}} (64) {{/U}} you can’t bring a live whale into the laboratory for study, no one {{U}} (65) {{/U}} just how these things work.
B．It’s
C．Theirs
D．Its
网考网参考答案：D
网考网解析：
这里要填入的只是个指称代词，即指出是谁的front flippers，前面在谈whale时用的是单数，所以这里要用单数的代词its。It’s是It is的缩写，theirs是所谓的代词的绝对形式，表示代词their和它后面所加的名词，如；Theirs is a big house等于Their house is a big house。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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