Octopuses might seem like ____________ mindless monsters.

• critically

• dreadfully

• gratefully

• absolutely

Octopuses are widely considered to be the most ______________ of all invertebrates.

• internal

• irrational

• intelligent

• irresistible

What is an invertebrate?

• An animal without eyes.

• An animal without legs.

• An animal without memories.

• An animal without backbones.

Octopuses can solve ______________ problems.

• complex

• complete

• complicate

• compliment

According to the text, which of the following can octopuses do? (複選)

• Taking notes.

• Opening a jar.

• Trapping a clam.

• Thinking up games.

Why did the author mention octopuses searching a cave?

• To explain how they find food.

• To provide more details about their lifestyle.

• To show their relationships with clam shells.

• To tell the readers that octopuses are multitasking.

The arms of octopuses are covered in powerful ____________.

• shells

• sirens

• suckers

• skeletons

Which of the following about octopuses is true? (複選)

• They have 2 hears.

• They have blue blood.

• Their blood is copper-based.

• Their skin is covered with some iron.

Which of the following takes up more energy of octupuses?

• Crawling.

• Walking.

• Swimming.

• Hunting.

What does the word "camouflage" mean?

• Posing a threat to other animals.

• Keeping hidden from predators.

• Spraying a toxic ink to blind others.

• Changing the color to blend in with the environment.