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Shark Attack!

Craig Rogers was sitting on his surfboard, scanning the distance for his next wave，when his board suddenly stopped moving. He looked down and was terrified to see a great white shark biting the front of his board. “I could have touched its eye with my elbow,” says Craig. The shark had surfaced so quietly that he hadn't heard a thing.

In his horror and confusion，he waved his arms and accidentally cut two of his fingers on the shark's teeth. He then slid off the opposite side of his surfboard into the water. Then, with Craig in the water and blood flowing from his fingers，the five-meter-long shark simply swam away, disappearing into the water below.

Although sharks are often categorized as killers that hunt and eat as many humans as they can, this is factually inaccurate. Sharks very rarely kill humans. A person has a greater chance of being struck by lightning or drowning in a bath than of being killed by a shark. Only 74 people have been reported killed by great whites in the last century. But great white sharks can reach six meters in length and weigh 2,200 kilograms or more. With frightening jaws that can hold up to 3,000 teeth arranged in several rows，they could very easily kill and eat a helpless human in the water. Why is it, then, that most people survive attacks by great whites? Shark researchers are trying to comprehend the reasons that allow people to escape without being eaten.

The most common explanation is that great whites don't see well. It has been thought that they mistake people for the seals or sea lions which make up a large part of their diet. There is reason to doubt this，however. Recent information shows that great whites can actually see very well. Also，when attacking seals, great whites shoot up to the surface and bite with great force. When approaching humans, however, they most often move in slowly and bite less hard. They soon discover that humans are not a high —fat meal. “They spit us out because we're too bony,” says Aidan Martin，director of Reef Quest Center for Shark Research.

Shark researchers like Martin hypothesize that great whites are actually curious animals that like to investigate things. It's possible that they use their bite not only to kill and eat, but also to gather information. Although such an experience is unlucky for people like Craig Rogers, when sharks bite surfboards or other objects or people，they are likely just trying to learn what they are.

詞匯：

scan vt審視，細看,瀏覽

elbow n.肘，肘部

surface n, 表面，外表；vi.浮出水面，浮現

drown vi.淹死，溺死

注釋：

1. ... cut two of his fingers on the shark's teeth.被鯊魚咬掉了兩個指頭。

2. A person has a greater chance of being struck by lightning or drowning in a bath than of being killed by a shark.比起被鯊魚殺死,人類更有可能被閃電擊中或是淹死在浴缸中。

練習：

1. After Craig Rogers fell into the water, the shark_________.

A) bit his surfboard

B) bit his fingers

C) swam away

D) attacked him

2. It is difficult for the author to understand why great whites_________.

A) often let humans escape

B) kill humans

C) have so many teeth

D) grow to six meters or more

3. Which of the following is closest in meaning to make up in line 2 of paragraph 4?

A) create.

B) are.

C) increase.

D) depend upon.

4. The word their in line 2 of paragraph 4 means_________.

A) people's

B) great whites'

C) sea lions'

D) seals'

5.What is the main idea of the fourth paragraph?

A) Great whites eat low-fat, bony meals more slowly.

B) Great whites see well enough to include seals, sea lions, and humans in their diet.

C) We now know great whites don't mistake humans for other animals.

D) There is reason to doubt that great whites see well enough to attack humans.

答案與題解：

1.C選項A(鯊魚咬沖浪板)和B(鯊魚咬他的手指)兩個選項發生在Craig落水之前，故排除這兩項。從第二段第三行可以得到如下信息：當Craig落入水中，手指上的鮮血在水中散開之時，這條五米長的鯊魚卻自己游走了。此信息排除了選項D(鯊魚攻擊他），因此答案為C (鯊魚自己游走了）。

2.A從第二段第一行我們可以看出：鯊魚被人類視為殺手，這是一條常識，很容易理解，因此選項B(殺人)被排除。而選項C(有很多牙）和D(長到六米長或是更長）只是對鯊魚的簡單描述，也屬于常識;而且文中并未出現對它們的質疑，說明作者也默認了這兩條常識。因此選項C和D也被排除。所以答案是A(常常讓人類逃脫），這在文中第三段得到了驗證，第三段整段就是在說雖然鯊魚可以輕松殺死人類，但是它們卻很少殺人。第三段最后兩行甚至提到就連鯊魚研究者們都在盡力尋找人類屢屢能鯊口逃生的原因，這就更能證明選項A是正確答案。

3.B本題要求讀者根據上下文的語境猜測第四段第二行斜體標出的詞組make up的意思。結合make up詞組前出現的單詞seal和sea lion以及它后面出現的詞組a large part of their diet,通過常識我們可以猜出：海豹和海獅應該是鯊魚的主要食物來源。比對四個選項，我們可以發現選項A(創造）、選項C(增加）和選項D(依靠）在意思上都說不通，代入原文無法構成有意義的一句話。因此只有選項B(是）在意思上和make up最為接近，代入原文也說得通。在本文中，詞組make up的意思為：組成，構成。

4.B本題要求讀者根據上下文的語境猜測第四段第二行斜體標出的單詞their的意思。結合第四段前兩行的內容，我們可以很容易推測出，在這里their指代的是the great whites(大白鯊），因此答案為B。

5.C本題要求讀者總結出第四段的主要內容。第四段主要介紹的是：人們起初以大白鯊視力不好為由來解釋人類為何屢屢鯊口脫險，但是最近的信息表明大白鯊的視力并不差，不會把人類誤認為是海豹或海獅。大白鯊不吃人是由于它們覺得人類太瘦，沒有海獅和海豹的肉那么肥。對比四個選項：選項A略顯片面，不是本段的主要內容，故排除。選項B中提到大白鯊也把人類當作食物來源，這點是錯誤的，故排除B。選項D中說的是人們開始懷疑這一論斷的正確性，但是選項D的表述和文中的信息正好相反;人們現在開始懷疑的是“大白鯊由于視力不好才去攻擊人類”這一論斷，而不是“大白鯊由于視力很好才去攻擊人類”，故排除D。所以正確答案為C(我們現在知道大白鯊不會把人類誤以為是其他動物）。

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