Read the passage and choose the best answer. Many people enjoy taking pictures of wild animals. However, photographers need to be patient. Animals may hide when people come close, so photographers often wait quietly for a long time. They may also use special cameras that can take pictures from far away. Good wildlife photographers do not simply take many pictures. They spend time watching animals and learning about their behavior before taking the best shot. What is the main idea of the passage?
A. Wildlife photography requires patience and careful observation.
B. Wild animals are usually afraid of all cameras.
C. Special cameras are necessary for taking good pictures.
D. Photographers should take as many pictures as possible.
Read the passage and choose the correct answer. Octopuses are very interesting sea animals. They have eight arms and can change the color of their skin. This ability helps them hide from enemies and sometimes surprise other animals. Octopuses are also good at moving through small spaces because they have no bones. When an octopus feels threatened, it may quickly change color, release dark ink, and swim away. According to the passage, why can an octopus move through small spaces?
A. It has very strong arms.
B. It can change the color of its skin.
C. It has no bones.
D. It can release dark ink.
Read the passage and choose the best answer. Daniel usually rides his bicycle to school. This morning, however, he looked outside and saw heavy rain. He checked the weather report and found that the rain would持续 for several hours. Daniel put his bicycle away, took an umbrella, and walked to the bus stop. When he arrived at school, his shoes were wet, but he was on time for class. What can be inferred about Daniel?
A. He dislikes riding his bicycle.
B. He changed his usual plan because of the weather.
C. He forgot where he had left his bicycle.
D. He usually walks to school in the morning.
Read the passage and choose the best answer. In some cities, people are planting gardens on the roofs of buildings. These gardens can provide flowers and vegetables, but they can also help the environment. Plants can make the air cleaner and help keep buildings cooler in summer. Roof gardens may also provide homes for insects and birds. For these reasons, some city governments are encouraging people and businesses to create more rooftop gardens. What is the author's main purpose in writing this passage?
A. To explain some benefits of rooftop gardens
B. To teach readers how to build a rooftop garden
C. To compare different kinds of city buildings
D. To explain why insects prefer city environments
Read the passage and choose the best answer. Some animals use sounds to communicate with one another. Whales, for example, can make sounds that travel long distances through the ocean. These sounds may help whales find other members of their group. **This is especially useful when whales are swimming in large areas where they cannot easily see one another.** Scientists have recorded whale sounds for many years to learn more about their social behavior. What is the function of the bolded sentence?
A. To explain why whale sounds can be useful
B. To describe how scientists record whale sounds
C. To show that whales cannot see underwater
D. To compare whales with other ocean animals
Read the passage and choose the best answer. When a forest fire starts, many animals leave the area quickly. Some animals can run away, while others fly or move underground. However, not all animals escape. Small insects may **remain** in the soil or under tree bark. These places can protect them from the heat and smoke. After the fire, some animals return to the area when it becomes safer. What does the word “remain” most likely mean in the passage?
A. stay
B. disappear
C. move quickly
D. become dangerous
Read the passage and choose the best answer. Plants need sunlight to make food. However, too much sunlight can sometimes damage a plant. In very hot areas, some plants have small leaves or a waxy covering. These features reduce the amount of water that leaves lose. As a result, the plants can keep more water inside their bodies and survive longer without rain. Why do some plants have small leaves or a waxy covering?
A. To receive more sunlight
B. To attract more insects
C. To reduce water loss
D. To grow more quickly
Read the passage and choose the best answer. A butterfly begins its life as an egg. After a few days, a small caterpillar comes out. The caterpillar eats leaves and grows quickly. Next, it forms a protective covering called a chrysalis. Inside the chrysalis, the insect changes greatly. Finally, an adult butterfly comes out. After its wings become strong, it can fly and begin the life cycle again. Which of the following shows the correct order of the butterfly's life cycle?
A. Egg → butterfly → caterpillar → chrysalis
B. Caterpillar → egg → chrysalis → butterfly
C. Egg → caterpillar → chrysalis → butterfly
D. Chrysalis → egg → caterpillar → butterfly
Read the passage and choose the best answer. Penguins live in several parts of the Southern Hemisphere. Emperor penguins, for example, live in Antarctica and can survive extremely cold temperatures. They have thick feathers and a layer of body fat that helps keep them warm. **Many people think emperor penguins are the most impressive birds in the world.** Scientists, however, are more interested in how these physical features help the penguins survive. Which statement is an opinion?
A. Emperor penguins live in Antarctica.
B. Penguins have feathers that help keep them warm.
C. Emperor penguins can survive extremely cold temperatures.
D. Emperor penguins are the most impressive birds in the world.
Read the passage and choose the best answer. Some birds travel thousands of kilometers every year to find food and suitable places to reproduce. Arctic terns are famous for making one of the longest migrations in the animal world. They travel from the Arctic to areas near Antarctica and then return. **This journey** can take them across oceans and over great distances. Scientists study the birds' migration to understand how they navigate and survive such long trips. What does “This journey” refer to?
A. Finding food
B. Reproducing in the Arctic
C. The Arctic terns migration between the Arctic and Antarctica
D. Scientists study of bird migration