Listen to a lecture about the helix shape to practise and improve your listening skills.

Do the preparation task first. Then listen to the audio and do the exercises.



Language level

Advanced: C1


I’d been attending science lectures for five years when I was student in faculty of science.I am still keen in the genetic subject, the development in this field is promising for example in medicine :curing difficult cases like cancer and some inherited diseases . furthermore, there are ongoing researches work on the human genome to find out why some people are more vulnerable to get sick with a disease while other has a resistance. Also in agriculture genetic engineering help to provide kinds of crops which has resistance to agricultural pest .

I can hear some lectures as this one on Ted talks. Ted talks are prevalent around the world, so it's wasted time to have to present something about them. The talks are divided into many categories covering almost issues around us. The issues are researched experiments or ideas of representers who come from everywhere on the globe. Besides sharing the ideas, Ted is also a very good place to learn English where you can listen to many kinds of accents. I've first known Ted like an online listening practice website, but after listening some talks on both apps and the website, I think Ted is renowned more on its shared fascinating ideas.

Dear Team,
I think,in Task 2/quest.5, we can write either ''alternating'' and ''alternate'',using it as an adjective.Could you check it , please, if I'm right?

Hello nikoslado

Yes, it appears that you are right, i.e. that 'alternate' is also possible in that sentence. In my experience, 'alternating' is much more commonly used, but I will change the exercise so that 'alternate' is also correct.

Thanks for pointing this out to us.

All the best


The LearnEnglish Team