Octopuses（章鱼）are famous for their round bodies,big eyes and eight arms.There are many different types of octopuses,but one thing about them is the same:They are good at disguising（伪装）themselves.Octopuses can change their appearance in less than a second!
An octopus can do this in three ways.One is by using color.An octopus\’s skin has special cells.These cells are filled with yellow,brown and red pigments（色素）.When an octopus moves its muscles（肌肉）in a certain way,the cells become large.These cells produce colorful spots and other patterns on the octopus\’s skin.The cells can also reflect light.Under blue light,for example,an octopus\’s skin will look blue.
An octopus can also change the texture of its skin.When the octopus moves its muscles,its skin can go from smooth（光滑的）to spiky.It might then look like a plant or coral.
Another way an octopus use is to change its shape.Some octopuses,for example,roll their bodies into balls so they look like rocks.One type of octopus can change its shape to look like other sea animals-especially dangerous ones,such as sea snakes.
Why are octopuses so good at changing their looks?They have to be.The ocean is not a safe place for them.Because they have no bones in their bodies,octopuses are like large pieces of meat.Many other sea animals want to eat them.To hide from these animals,octopuses have developed this amazing ability.
（1）How do octopuses change their looks? ______
A.By moving their cells in a special way.
B.By learning to act like other sea animals.
C.By changing their colors,textures of skin and shapes.
D.By changing their colors,textures of skin and muscles.
（2）What does the underlined word"spiky"mean in English? ______
A.awful
B.pointed
C.dirty
D.colorful
（3）According to paragraph 5,why do octopuses change their looks? ______
A.To find a safe place in the ocean.
B.To cheat and hunt other sea animals.
C.To protect themselves from other sea animals.
D.To get large pieces of meat from other sea animals.
（4）Which statement is true according to this passage? ______
A.Octopuses can only try to look like plants.
B.It is impossible for octopuses to roll their bodies.
C.Octopuses can change their looks in a short time.
D.Under pink light,an octopus\’s skin may look blue.
（5）What is the structure of this passage? ______
A.①/②③/④⑤
B.①/②③④/⑤
C.①②③/④/⑤
D.①②/③④/⑤