听力音频：
Question 31-40
Write ONE WORD ONLY for each question below.
Invasive Species:
Source:
Some invasive species can take over a 3. ______
mainly come to land by birds and 32. ______
In Western US the common broom is originally from 33. ______
The invasive species affect the economy like 34. ______ industry.
To deal with the problem, they use biological control in form of 35. ______
In 1975, Japanese Barberries are imported to the US from 36. ______
Common buckhorn:
Yellow 37. ______ under the broom.
They grow in 38. ______ called ultimate leaves
Spread media:
Flowers seeds eaten by birds are the main 39. ______ pattern
Application:
treat serious 40. ______ problems
答案
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