综合写作：
Plastic debris in the oceans is a huge environmental concern. Recently, it has been proposed that a device called an Ocean Cleanup Array (OCA) could collect and remove plastic from the oceans. This device consists of floating barriers three meters deep and 100 kilometers long. The barriers are anchored to the ocean floor, and natural ocean currents carry the plastic toward the barriers, where the plastic is pooled and collected. The designers of this system claim that it will allow for efficient cleanup, with little negative effect on the environment, for several reasons.
Cost
First, the brilliance of this device is that it does not expend much energy because it makes use of natural ocean currents to bring the plastic to it. Its functioning is therefore quite inexpensive compared with other ocean cleanup methods. For a cost of about 400 million dollars, one device can remove up to 7 million kilograms of plastic every year. This is about 30 times less expensive per unit of plastic removed than any other ocean cleanup method.
Minimal Impact on Marine Life
Second, other cleanup methods often rely on nets, which can entangle and injure marine animals. The floating barriers of the OCA are solid and fixed in one location, meaning that swimming animals can easily avoid them and will not get caught or trapped by the structure. Thus, there will be minimal impact on marine life.
Recycling
Finally, the large quantities of plastic that will be collected by the device can be recycled. The two most common types of plastic in the ocean are polyethylene and polypropylene. Each of these types of plastic can be processed by recycling plants. Plastic collected from the ocean can therefore be sold to recycling facilities.
学术写作：
Your professor is teaching a class on Education. 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
This week we talked about how important taking time off from work or school is for people’s well – being. Some people believe they get the most benefit when that time off is structured; that is, it involves planning in advance about what will be accomplished on that day. Others believe it is better to enjoy the day with no plan for how to spend it. In this discussion post please indicate which of these approaches to spending time off from work or school you prefer and why?
Andrew
I find it beneficial to do some advance planning for my free time. I live far away from my family so when I am getting ready to visit them during a school holiday, I always plan my time off from school very carefully. That way I have enough time to visit with each family member.
Claire
Personally, I prefer not to make any plans for my free time. I go to school, and I have a part – time job each week. I make a schedule to be sure I can complete both my work and my studies. So when I take time off from work and school, I just want to relax with no plan.
