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When you’re packing for an adventure, what’s the most important thing you’ll need? 1. Or better yet, a GPS. What about other animals, how do they know where they’re going?

While humans depend on technology to travel, some animals have something far more advanced. Researchers, mainly from Oregon State University, US, found that Chinook salmon (鲑鱼) have a “built-in GPS” of the Earth’s magnetic field. 2.It acts like a big map inside their brain.

Scientists placed some baby salmon into a big swimming pool. To simulate (模拟) the Earth’s magnetic field, they put magnetic coils (线圈) all around the pool. Then, by changing the direction of the coils, the salmon began to change their own direction. They started to face in the direction of their ocean feeding area. 3.When the scientists changed the coils to the opposite side, the salmon also turned in the opposite direction. Just by using their “built-in GPS”, the salmon were able to figure out the direction of their feeding area.

4.The scientists believe that their navigation skills came through evolution. The fish that were able to reach the feeding area lived longer. 5.So if you’re ever lost and in need of some help, maybe you should ask a salmon to point you in the right direction!

A. How did Chinook salmon get their “built-in GPS”?

B. If you don’t want to get lost, you’ll need a map!

C. This is a safe place in the ocean where salmon can find food to eat.

D. Then they could pass on their navigation skills to their babies.

E. However, the magnetic field is likely not the only tool salmon use to navigate.

F. It turns out young salmon don’t just learn quickly, they don’t need to learn at all.

G. This means as soon as they are born they are able to direct themselves in the ocean.

高一英语七选五中等难度题

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