2019年10月26日托福听力真题原文+题目+答案+MP3下载：extract seeds proteins

2019年10月26日托福听力真题原文+题目+答案+MP3下载：extract seeds proteins

部分原文如下：

Teacher: I'm sure most of you know that we've been able to extract certain compounds from plants for use in medicine. Um, compounds like proteins. Proteins from some plants can be used in medicines as antibodies in vaccines. And we can even cause some plants to produce certain proteins by incorporating DNA into the plants cells, usually in the leaves. We then extract the proteins to use as antibodies. However, we've never been able to produce enough protein to make the process worthwhile. It hasn't been practical, until now. Now it appears that it is possible to get a large amount of useable proteins from plants. Some researchers have recently succeeded in doing this by using plant seeds to produce these proteins, rather than the leaves or the other parts of the plant. Now there are a number of advantages to getting protein from plant seeds to produce antibodies. (2)But we have to be sure that these proteins are just affective as human proteins, and so far the research has shown they are. That antibodies produced from plants seed proteins are effective in humans, which is great. Because typically antibodies for vac6ines and medicines too are produced from microorganisms like yeasts or bacteria and it's a rather complicated process.

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部分题目如下：

1、W hat is the lecture mainly about

A、The costs of extracting proteins from plants to make vaccines

B、The modification of seeds to increase plant reproduction

C、The benefits of using plant seeds to obtain proteins for vaccines

D、The use of proteins in animal cells to produce vaccines

2、According to the professor, what did the researchers learn about proteins produced from plant seeds

A、They produce antibodies that are effective in humans

B、They are difficult to extract.

C、They are more suitable for medicinal use than antibodies produced from bacteria and yeasts.

D、They do not survive as long as proteins produced from leaves

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完整版2019年10月26日托福听力真题原文+题目+答案+MP3下载：extract seeds proteins，10元有偿！