剑桥雅思13语音下载资料汇总!对于听力部分，音频资料是大家提高听力的重要内容，不断地适应英语听力的环境，才能够让我们从听力中，听出关键的信息点。下面小编为大家整理了详细的内容，供大家参考!
SECTION 3 Questions 21-30
Questions 21-24
Choose the correct letter, A, B or C.
Project on using natural dyes to colour fabrics
21.What first inspired Jim to choose this project?
A textiles displayed in an exhibition
B a book about a botanic garden
C carpets he saw on holiday
22.Jim eventually decided to do a practical investigation which involved
A using a range of dyes with different fibres.
B applying different dyes to one type of fibre.
C testing one dye and a range of fibres.
23.When doing his experiments, Jim was surprised by
A how much natural material was needed to make the dye.
B the fact that dyes were widely available on the internet
C the time that he had to leave the fabric in the dye.
24.What problem did Jim have with using tartrazine as a fabric dye?
A It caused a slight allergic reaction.
B It was not a permanent dye on cotton.
C It was ineffective when used on nylon.
Questions 25-30
What problem is identified with each of the following natural dyes?
Choose S IX answers from the box and write the correct letter, A—H, next to Questions 25-30.
Problems
A It is expensive.
B The colour is too strong.
C The colour is not long-lasting.
D It is very poisonous.
E It can damage the fabric.
F The colour may be unexpected.
G It is unsuitable for some fabrics.
H It is not generally available.
Natural dyes
25 turmeric .............
26 beetroot .............
27 Tyrian purple .............
28 logwood .............
29 cochineal .............
30 metal oxide .............
谈话场景：作业场景
人物关系：学生Jimhe导师
谈话话题：关于天然燃料使用问题的讨论
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