听力音频：
Questions 31-40
Complete the notes below.
Write ONE WORD ONLY for each answer.
The Invasion of Plants
General Features
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Some species take over a 31…….
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Mainly enter new environment with the help of birds and 32…….
Three Species
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Common Broom
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Original from: 33…….
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Economic problem: affect commodity industries like 34…….
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Biological control such as 35…….
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Japanese Barberry
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In 1975, seeds invaded USA from 36…….
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Typical feature: yellow 37…….
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Common Buckthorn
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Leaves: 38…….dark, green
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Spreading via: during the course of birds’ long 39…….
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Unlike sea buckthorn, which is used as treatment to serious 40…….problems
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答案
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