墨尔本PTE 阅读排序 2906

A - The hottest part of a chilli is not the seeds, as many people think, but the white flesh that houses the seeds, known as the placenta.   

B - In the late 19905, scientists identified the pain nerves that detect capsaicin: the chemical in chillies responsible for most of the burning sensation in our mouth.   

C - But it’s only during the last few years that scientists have also learnt why chillies evolved to be spicy in the first place, and they have managed to cultivate new varieties that are up to 300 times hotter than the common Jalapeno.   

D - Humans have been cultivating chillies as food for 6,000 years, but we are still learning new things about the science behind their heat and how it reacts with our body.