B(2025·江苏苏州姑苏区期末)
Cities are full of tall buildings, factories, and cars. They are very useful places for people to live. However, for animals, living in a city can be very difficult. This is why some animals have changed to survive city life.

The peppered moth(花斑蛾), for example, changes its colour to survive in the city. The quality of the air in the city is not quite good. This makes the surface of trees darker. The peppered moth changes to a darker colour to match the trees. In this way, it can hide from other animals.
The great tit(山雀) changes its voice to survive in the city. It sings to find a mate. But in the city, it is too noisy for other birds to hear it singing. So the great tit changes its song to a higher pitch(音调).
In the forest, the crow drops seeds and nuts from high above to break them on the ground. Then it can get the food inside. However, the city crow has a better idea. It drops its seeds on the street and waits for cars to break them. Then it quickly flies down and picks up its meal.
(
A
)4. The peppered moth changes colour to match the
.
A. trees
B. cars
C. people
D. air
(
C
)5. How does the city crow break seeds?
A. By breaking them with tools.
B. By making other animals do it.
C. By dropping them and waiting for cars to do it.
D. By dropping and breaking them on the ground.
(
D
)6. What's the main idea of this passage?
A. The animals in cities change their colours.
B. Birds in cities change their singing voices.
C. Cities are useful places for animals and people.
D. Some animals make changes to survive in cities.