综合写作：
Gamba grass, a tall tropical grass native to Africa, was introduced into Australian pastures in the twentieth century. However, gambau grass has spread and is now a declared pest. In the areas where itd grows, it spreads quickly and reduces natural biodiversity, driving out Australia’s native grasses and other plants. Several methods have been proposed to control gamba grass.
Chemical methods
One way of controlling gamba grass is to use chemical treatment. Chemical treatment consists of spraying gamba grass with herbicides -substances toxic to plants when absorbed. Herbicides are rather inexpensive, and small amounts are typically sufficient to treat large areas of gamba grass. The low cost and easy application of chemical methods make their use attractive for eradicating gamba grass.
Rehabilitation methods
Another method of controlling gamba grass is rehabilitation. Ind addition to invading land where native plants already grow, gamba grass also spreads to areas where there is little or no vegetation,d such as the sides of roads. The process of rehabilitation involves planting native plants in those areas while the gamba grass infestation is still small. This method will not completely eliminate gamba grass, but as the native plants thrive, the expansion of gamba grass will be limited.
Biological methods
Finally, some scientists have proposed a radical strategy of biological control. Gamba grass grows too tall and too dense to be a food source for any of the wild grazers living in Australia, such as kangaroos. However, in its native Africa, gamba grass provides an excellent food source for large herbivores, such as elephants. Relocating some elephants to Australia would restore the ecological balance there, as these large herbivores would help control gamba grass.
学术写作：
Your professor is teaching a class on business management. Write a post responding to the professor’s question.
In your response, you should do the following.
- Express and support your opinion.
- Make a contribution to the discussion in your own words.
An effective response will contain at least 100 words.
Dr. Diaz
With so many opportunities to connect nowadays, some people believe that no matter which country we come from, we have more similarities than we have differences. However, others have observed that differences between themselves and people from other countries are growing. In your view, are differences between people from different countries increasing, or are they diminishing? Why?
Andrew
I think the differences among us are decreasing as our exposure to products from other countries grows. We can enjoy food from any country. We can watch movies made in faraway places. We can go to a store and buy authentic goods from around the world. These things become part of our normal life and make our differences seem smaller.
Kelly
I understand what Andrew is saying, but for some people, being exposed to differences makes them retreat into their own corner even more. Look at social media. We are exposed to many different people and ideas, but a lot of people talk only those they agree with and ignore the rest. This only makes the differences between people increase.
