托福听力真题+题目+答案+mp3下载：Biofilms

托福听力真题+题目+答案+mp3下载：Biofilms

托福听力真题题目如下：

1、What does the professor mainly discuss

A、Reasons that biofilms were poorly understood until the 1970s

B、The formation and behavior of a type of bacterial community

C、Potential benefits associated with bacterial growth

D、The size and chemical composition of biofilms

2、What does the professor say about the water channels in biofilms Click on 2 answers

A、They allow bacteria to change locations within the biofilm

B、They interfere with the growth of the biofilm

C、They serve to bring in food and dispose of waste

D、They are not created by all species of bacteria

3、According to the professor, how are biofilm bacteria different from free-floating bacteria

A、Biofilm bacteria have a lower reproduction rate

B、Biofilm bacteria need more nutrients to produce polysaccharide

C、Biofilm bacteria are less vulnerable to disinfectants

D、Biofilm bacteria cannet separate from other bacteria

。。。。。余下托福听力真题题目及答案省略！

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5元有偿下载托福听力真题+题目+答案+mp3下载：Biofilms