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综合写作
The Russian thistle has an unusual method of spreading its seeds. It lives for a year, and when it dies, the top part of the plant dries up and separates from its roots. This dried tangle of leaves and branches—known as a tumbleweed—is blown along the ground by the wind, releasing seeds as it travels. Russian thistle is not native to the United States but has become established there as an invasive species. Invasive species are often considered harmful, but some scientists point out that this plant offers a number of benefits.
Food for Farmers’ Animals
First, Russian thistle can grow in dry areas where many other plants cannot, and it can survive long periods of little or no rain. It also has some nutritional value and can be eaten by large animals such as cows. In times of drought, when other plants cannot grow because of lack of rain, farmers can sometimes help their animals get enough nutrition by feeding them Russian thistle.
Habitat Creation
Second, Russian thistle can grow up to a meter high. As it often grows in regions with no trees, its size sometimes makes it the largest plant in the area. It thus creates valuable habitats for animals that would otherwise have no place to live. Small mammals and birds can take shelter under Russian thistles.
Soil Improvement
Finally, Russian thistle can grow in damaged soil where many native plants cannot. Once Russian thistle begins to grow in damaged soil, a fungus sometimes infects its roots. This fungus does two things. It weakens the Russian thistle, and it benefits certain native plants. As the fungus spreads in the soil, it supports the return of native plants to damaged areas, where they can then grow and flourish in the soil again, thanks to the fungus.
学术写作：
教授：是否应该取消骑自行车戴头盔的强制要求？
Andrew：应该取消，能鼓励更多人骑行。
Claire：不应该取消，保证安全。
Dr. Achebe: Recently, the town has decided to revoke the mandatory helmet-wearing rule for cyclists. This decision has sparked debate among residents. Some argue that it promotes freedom and convenience, while others express concerns about safety. Considering this, do you believe suburban governments should respond to citizens’ demands to remove helmet regulations for cyclists? Why or why not?
Andrew: I support the removal of helmet regulations for cyclists. Wearing a helmet is cumbersome and inconvenient, discouraging people from cycling altogether. Removing this requirement would likely encourage more people to choose cycling as a mode of transportation, promoting healthier and more environmentally friendly lifestyles.
Claire: People should consider the implications of this policy. It’s important to adhere to government regulations for safety reasons. Helmet laws are in place to protect cyclists from head injuries in case of accidents. So, even though some may view the removal of helmet regulations as promoting freedom, helmets keep you safe.
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