Four hours later, the sharks that could smell were two-thirds of the way back home and had swum in very straight paths. But the ones with blocked noses took erratic routes and only made it about half as far. Nosal thinks they all eventually got back home. 揂nd we know that because even though they didn抰 get as close to shore and even though their paths were more winding (e.蜿蜒的), their movements were still towards the shore. On average, they still finished closer to the shore than when they started.” And those cotton balls eventually break down, returning the sharks to normal. The experiment is the first to show that sharks can indeed sniff their way back home. For Nosal, the next question is: If sharks navigate by smell, what exactly is it they’re smelling that leads them by the nose?

　　12. According to the passage, sharks can find their way through ____.

　　A. taste

　　B. sound

　　C. light

　　D. smell

　　13. How did Nosal and his team prove their idea?

　　A. By doing an experiment.

　　B. By making a questionnaire.

　　C. By analyzing data.

　　D. By watching sharks’ habitat.

　　14. What does the underlined word “erratic” mean?

　　A. Direct.

　　B. Round.

　　C. Irregular.

　　D. Rough.

　　15. What can be concluded from the last paragraph?

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