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课件网) Using language(2)— Listening and Speaking 1.Get the main idea of the listening material; 2.Understand the relationships between different species and the importance of ecological balance. Look at the diagram and answer the questions. 5 1. What does the diagram show 2. What are the relationships between the living things The diagram shows a food chain—the connection between the living things. The living things are closely connected with each other by the food they eat. Secondary consumers prey on primary consumers, primary consumers feed on producers, and producers absorb light from the sun, and water and dissolved nutrients from the soil, which are provided by decomposers. In a woodland ecosystem, trees and other plants are producers. They 1._____ water, and take in nutrients from the soil and energy from the sun. Insects are an example of a primary consumer. They 2. _____ the producers to provide food for them, and are 3. _____ by secondary consumers: small mammals and birds. They 4. _____ the primary consumers. Worms, fungi and bacteria are decomposers. They 5. _____ animal waste and the remains of living things. The chemicals these decomposers 6. _____ fertilise the soil and give the plants the nutrients they need to grow. absorb rely on fed on prey on break down release 6 Complete the speech with the correct form of the words and expressions in Activity 5. One of the oldest species in the ecosystem, the honey bee has been in existence for millions of years. A honey bee can fly as fast as 24 kilometres per hour and its wings can beat 200 times per second. In just one journey to collect pollen and nectar, one single honey bee can pollinate as many as 50 to 100 flowers. 7 Listen to the conversation and choose the true statements. 1 Bees are very important to our food supply because they provide honey. 2 The bee population is declining. 3 Without bees, humans would die out. 4 All human crops depend on bees for pollination. 5 If bees became extinct, other insects could pollinate enough crops. 6 Humans are responsible for the decline in the bee population. √ √ √ 8 Listen again and complete the flow chart. A combination of things damages bee habitats, mainly 1._____. pesticides and climate change The bee population is 2._____. According to statistics, bee numbers in the US 3._____ in just one year. declining very quickly have fallen by 17% Without bees, crops would 4._____. 5._____ would not be able to compensate for the loss of bees, because 6._____of the species of crops. be unable to reproduce Other insects bees are responsible for pollinating about 70% Animals that live on the crops 7._____. Humans have nothing to eat and die out. would die out Expressing doubt Responding to doubt You must be kidding! Are you sure about... I don’t believe it! Check it out for yourself... It’s a fact! According to statistics... Don’t forget that… You must be kidding! I don’t believe it! Ar ... ...
