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    Plants need (hot). 【查看更多】

     

    题目列表(包括答案和解析)

        Algae are plants which have no roots or leaves. They grow in wet places. You may have seen algae on top of the water in a pond or a lake. Algae will even grow in fish bowls. Most algae are green or blue-green, but some are red, brown or black.

    　　Often, you buy algae at the drugstore, but you don't know it. Some kinds of algae ale used in making ice-cream, toothpaste, skin creams and medicine.

    　　Algae do not look or taste good, but they are high in food value. They can be easy to grow. They can be made into flour. Men are working to make algae taste better. Then they can be used for food.

    　　Tomorrow more people will live in the world. They will need more food to eat. Algae are easy to grow. They may become an important food.

    　　Algae can grow on spaceships. The men who go out into space may have their own algae garden. Then they will not run out of food.

    Choose the best answer.

    　

    (1). Algae grow in __________ places.

    A．wet

    B．dry

    C．hot

    D．warm

    (2) There can't be algae in_________.

    A．fish bowls

    B．medicine

    C．eggs

    D．flour

    (3)Men are working to make algae taste better because__________.

    [　　]

    A．they don't look or taste good

    B．they are green

    C．they are high in food value

    D．they can be used for food

    (4) Which of the following is true?

    A．Algae may help to feed people tomorrow.

    [　　]

    B．Algae are good for fish.

    C．Algae can only grow on the earth.

    D．Algae are very expensive.

    (5) The best title for this passage is _________.

    [　　]

    A．The Most Important Food -- Algae.

    B．Algae May Become Men's Food.

    C．How to Grow Algae?

    D．Where to Grow Algae?

    查看答案和解析>>

    (阅读理解)

    Everybody needs water. All plants need water. We use water to wash cups, cars, clothes and ourselves.

    Where does all water come from? It comes from the clouds. The clouds can change into rain. Some of the rain goes down the ground. Some of the rain water goes down the mountains into streams（小溪）. The streams come together to make rivers and lakes.

    Water can change itself. When water gets very cold, it becomes ice. When water gets very hot, it becomes steam（小蒸气）.

    (1)

    _____ need water.

    　　 A. Only animals

    B. Only plants

    C. Only people　　

    D. All living things

    [　　]

    (2)

    We usually clean our clothes with ______.

    　　 A. steam　　　　

    B. clouds　　　　

    C. water　　　　

    D. rain

    [　　]

    (3)

    The water in the streams comes from the _____ .

    　　 A. river　　　　

    B. lake　　

    C. wind　　　　

    D. clouds

    [　　]

    (4)

    when the weather gets very ____, water changes into ice.

    　　 A. warm　　

    B. hot　　　　

    C. cool　　　　

    D. cold

    [　　]

    (5)

    where does steam come from?

    　　 A. It comes from the clouds.

    B. It comes from plants.

    　　 C. It comes from very hot water.

    D. It comes from very cold water.

    [　　]

    查看答案和解析>>

    Do you know how to keep fish at home?
    The fish need room. They must not be crowded（拥挤）. Fish need oxygen(氧气). Fish get it from water in the tank. There must be enough water for all fish in the tank. So the size of the tank is important..
    In the tank many people put small plants(植物). They give oxygen to the water. Plants help in other ways, too. Fish can nibble(轻咬)on the plants. They hide in the plants and sleep, lay eggs there.
    Both the plants and fish need light. You can put near a window. It will get light there. But remember: a window may let cold air in. The cold can kill(杀死) your fish. Too hot water can kill your fish, too.
    The fish need food and you should feed them every day. Giving them too much food is bad. It will make the water dirty. However, the fish should get just enough food. They should finish the food in 10 minutes. No extra(多余) is left. When this happens, the amount(数量)of food is right.
    (   )16. A tank near the window may NOT be good for pet fish because________.
    A. no air can get in through the window   B. pet fish will jump out of the window
    C. plants in the tank will grow too big     D. cold air may make the water too cold
    (   )17.________is very important to pet fish.
    A.  Water    B.  Sunlight   C. The size of the tank      D. All the above
    (   )18. Which of the following may cause（导致） pet fish to die?
    A. Too little room for fish.             B. The plants in the tank.
    C. The light through the window.        D. A lot of water in the tank.
    (   )19. The word "this" in the last paragraph refers to(指的是)________.
    A. giving pet fish too much food           B. giving pet fish too little food
    C. giving pet fish the right amount of food    D. giving pet fish enough water
    (   )20. This passage mainly talks about______________.
    A.why fish must be put in a glass tank   
    B. how people should keep their pet fish
    C. what kind of plants is good for pet fish
    D. how much food should we give to pet fish

    查看答案和解析>>

    Do you know how to keep fish at home?
    The fish need room. They must not be crowded（拥挤）. Fish need oxygen(氧气). Fish get it from water in the tank. There must be enough water for all fish in the tank. So the size of the tank is important..
    In the tank many people put small plants(植物). They give oxygen to the water. Plants help in other ways, too. Fish can nibble(轻咬)on the plants. They hide in the plants and sleep, lay eggs there.
    Both the plants and fish need light. You can put near a window. It will get light there. But remember: a window may let cold air in. The cold can kill(杀死) your fish. Too hot water can kill your fish, too.
    The fish need food and you should feed them every day. Giving them too much food is bad. It will make the water dirty. However, the fish should get just enough food. They should finish the food in 10 minutes. No extra(多余) is left. When this happens, the amount(数量)of food is right.
    (   )16. A tank near the window may NOT be good for pet fish because________.
    A. no air can get in through the window   B. pet fish will jump out of the window
    C. plants in the tank will grow too big     D. cold air may make the water too cold
    (   )17.________is very important to pet fish.
    A.  Water    B.  Sunlight   C. The size of the tank      D. All the above
    (   )18. Which of the following may cause（导致） pet fish to die?
    A. Too little room for fish.             B. The plants in the tank.
    C. The light through the window.        D. A lot of water in the tank.
    (   )19. The word "this" in the last paragraph refers to(指的是)________.
    A. giving pet fish too much food           B. giving pet fish too little food
    C. giving pet fish the right amount of food    D. giving pet fish enough water
    (   )20. This passage mainly talks about______________.
    A.why fish must be put in a glass tank   
    B. how people should keep their pet fish
    C. what kind of plants is good for pet fish
    D. how much food should we give to pet fish

    查看答案和解析>>

    Do you know how to keep fish at home?

    The fish need room. They must not be crowded（拥挤）. Fish need oxygen(氧气). Fish get it from water in the tank. There must be enough water for all fish in the tank. So the size of the tank is important..

    In the tank many people put small plants(植物). They give oxygen to the water. Plants help in other ways, too. Fish can nibble(轻咬)on the plants. They hide in the plants and sleep, lay eggs there.

    Both the plants and fish need light. You can put near a window. It will get light there. But remember: a window may let cold air in. The cold can kill(杀死) your fish. Too hot water can kill your fish, too.

    The fish need food and you should feed them every day. Giving them too much food is bad. It will make the water dirty. However, the fish should get just enough food. They should finish the food in 10 minutes. No extra(多余) is left. When this happens, the amount(数量)of food is right.

    (   )16. A tank near the window may NOT be good for pet fish because________.

    A. no air can get in through the window   B. pet fish will jump out of the window

    C. plants in the tank will grow too big     D. cold air may make the water too cold

    (   )17.________is very important to pet fish.

    A.  Water    B.  Sunlight   C. The size of the tank      D. All the above

    (   )18. Which of the following may cause（导致） pet fish to die?

    A. Too little room for fish.             B. The plants in the tank.

    C. The light through the window.        D. A lot of water in the tank.

    (   )19. The word "this" in the last paragraph refers to(指的是)________.

    A. giving pet fish too much food            B. giving pet fish too little food

    C. giving pet fish the right amount of food    D. giving pet fish enough water

    (   )20. This passage mainly talks about______________.

    A.why fish must be put in a glass tank   

    B. how people should keep their pet fish

    C. what kind of plants is good for pet fish

    D. how much food should we give to pet fish

     

    查看答案和解析>>


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