Thorrold can tell, for example, if a fish spent time in the open ocean before entering the less salty water of coastal areas. He can basically tell where fish are spending their time at any given stage of history.

　　In the case of the Atlantic croaker, a popular saltwater food fish, Thorrold and his assistant have successfully followed the travelling of young fish from mid-ocean to the coast, a journey of many hundreds of miles.

　　This is important to managers in the fish industry, who know nearly nothing about the whereabouts of the young fish for most food fish in the ocean. Eager to learn about his technology, fish scientists are now lending Thorrold their ears.

　　1. What can we learn about fish ears from the text?

　　A. They are small soft rings.

　　B. They are not seen from the outside.

　　C. They are openings only on food fish.

　　D. They are not used to receive sound.

　　2. Why does the writer compare the fish to trees?

　　?A. Trees gain a growth ring each day.

　　B. Trees also have otoliths.

　　C. Their growth rings are very small.

　　D. They both have growth rings.

　　3. Why is it important to study the chemistry of otolith rings?

　　A. The elements' of the otoliths can tell the history of the sea.

　　B. Chemical contents of otoliths can tell how fast fish can swim.

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