综合写作：
During the day, most plants position their leaves so the leaves can collect sunlight. However, at night, some plants fold their leaves. There is no general agreement about why this occurs, but there are several competing theories as to why it might be beneficial for plants to fold up their leaves at night.
Protection Against Infection
Folding leaves may be a mechanism to keep the leaves from getting wet if it rains. Leaves are vulnerable to diseases caused by fungal infection. When leaves are wet, the chance of infection is greater, since fungal spores (small particles through which fungi reproduce) require water to spread to new locations. If the leaves stay dry, the risk of fungal infection is reduced.
Elimination of Nighttime Light
Finally, many plants need to keep track of the time of year in order to produce flowers at the right time. These plants often keep track of the season based on how much sunlight there is in a day. Plants’ sense of time can be distorted when their leaves are exposed to sources of light at night, such as moonlight. The purpose of folding leaves may be to limit leaf exposure to nighttime light, which may help plants track the seasons more accurately.
学术写作：
Instructions
Your professor is teaching a class on sociology. 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. 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 cycling? Why or why not?
Andrew
I support the removal of helmet regulations for cycling. Wearing a helmet seems 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.
