중2 동아 윤정미 4과 본문 변형

People once ____ that only humans can use tools.

Now, scientists are finding out that many animals can also use ____

If you go to a Buddhist temple in Lop ____ Thailand, watch out for the Macaque monkeys.

They may come to ____ and pull out your hair.

They use human hair to ____ their teeth.

If you are lucky, you may see female ____ that are teaching flossing to their babies.

While the babies are watching, ____ female monkeys floss their teeth very slowly.

This way, the baby monkeys ____ to floss.

____ don’t usually think that octopuses are smart.

However, octopuses are very smart, and ____ can also use tools.

They use coconut ____ for protection.

When they can’t find a good hiding place, they ____ under coconut shells.

Some octopuses even store coconut shells ____ later use.

They pile the coconut ____ and carry them to use later.

____ smart!

In Aesop’s fable The Thirsty Crow, a crow drops stones into a jar ____ raise the level of water.

You may think this is ____ a story, but it is not.

Scientists who ____ studying crows did an experiment.

They put a jar with water in front ____ a crow.

A worm was ____ on top of the water.

However, the water level was low, ____ the crow could not eat the worm.

The crow solved the ____ just as in the fable.

It dropped stones ____ the jar.

____ you think this bird is special, you are wrong.

Scientists did the same experiment ____ other crows, and they all did the same, too.