大海原を旅するイメージのウミガメ。ガラパゴスで9匹を追跡したら、1匹も諸島の外へ出なかった

Q1. What is the passage mainly about?

1. ATurtles that stayed close to home in the Galápagos
2. BHow turtles lay their eggs on beaches
3. CWhy satellites stop working in the ocean
4. DA new kind of turtle found in Japan

旅で有名なウミガメが、ガラパゴスでは島の近くにとどまっていた話なので A。

Q2. How long did the trackers send signals?

1. AFor up to 9 days
2. BFor up to 45 days
3. CFor up to 418 days
4. DFor up to ten years

The trackers sent signals to satellites for up to 418 days. とあるので C。

Q3. In this passage, "shallow" water is water that is ...

1. Avery cold
2. Bnot deep
3. Cfull of salt
4. Dfar from land

shallow は「浅い」で、deep（深い）の反対なので B。カメは島の近くの浅い海で食べていた。

Q1. What did the tracking show?

1. AThe turtles laid eggs on every island.
2. BNone of the turtles left the island group.
3. CThe trackers stopped working after one day.
4. DThe turtles ate only fish.

none of the nine left the island group とあるので B。産卵や食べ物が魚だけという話は出てこない。

Q2. Which statement about the yellow turtles is true?

1. AThey are known to nest on Galápagos beaches.
2. BThey probably came from the eastern Atlantic.
3. CThey are not known to lay eggs in the Galápagos.
4. DAll nine of them were females.

is not known to lay eggs in the Galápagos とあるので C。9匹のうち7匹はオス。

Q3. Why might the sex of the turtles matter for the result?

1. ABecause females cannot carry trackers
2. BBecause most of the tracked turtles were males, which usually travel shorter distances
3. CBecause males always lay eggs far away
4. DBecause the scientists tracked only young turtles

7匹がオスで、西アフリカの研究ではオスはメスより短い距離しか移動しなかったので、「とどまった」結果にオスの多さが影響した可能性がある。正解は B。

Q1. What is the main idea of the passage?

1. AYellow-morph turtles in the Galápagos stayed within the islands while they were tracked, though the sample has clear limits.
2. BGreen turtles never migrate after they become adults.
3. CSatellite trackers are too weak to follow turtles in the ocean.
4. DFemale turtles travel shorter distances than males.

追跡中は諸島内にとどまったという結果と、オスへの偏りなどの限界の両方を述べているので A。D は本文と逆（オスのほうが短い）。

Q2. Why does the author say the average home range "says little about a typical turtle"?

1. ABecause the average was too small to measure
2. BBecause the turtles were tracked for only one day
3. CBecause individual turtles differed very widely
4. DBecause only females were measured

individuals differed so widely that the average says little about a typical turtle とあるので C。

Q3. Which explanation for the result does the author consider possible?

1. AThe turtles were too old to swim long distances.
2. BThe tracking may have covered only the period between breeding trips.
3. CThe Galápagos has no food for turtles.
4. DThe trackers made the turtles afraid of the open sea.

The turtles may have been caught during the long stretch between breeding trips. とあるので B。