Nowadays, there exists a kind of mosquitos spreading a certain disease. Scientists created a new species of modified genetic mosquitos to intercourse with those mosquitos, leading to the defects of their descendants in order to reduce the population of mosquitos that diffuses the disease which is able to help precluding the disease. However, a amount of people don't consider the idea proposed in the passage a good one.
First of all, the listening material points out that the decrease of this species of mosquitos may lead to the increase of other species of mosquitos that carries the same or even more threatening virus and thus things will go contrary to our wishes.
In addition, people is afraid that the modified genetic mosquitos is likely to bite people and inject people with some artificial genes which can do no good to our health. Before carrying out this plan, scientists is required to make sure that collateral damage is going to happen.
Last but not least, the lecturer indicates that it’s possible that modified genetic mosquitos can cause environmental issues. As a result, they may effect other species and bring labile factors to the fragile ecosystem. The example of modified genetic vegetable can well illustrate this point. Scientists brought about a kind of modified genetic vegetable to get over its drawbacks while keep its merits. But this movement came to an end because of the consequence of the half decrease of butterflies around this kind of vegetable.As above mentioned, the reading and the listening contents are opposing.