综合写作：
The black robin is a small bird native to the islands of New Zealand. Several decades ago, black robins almost died out. Although the future of the species remains uncertain, efforts to save the black robin from extinction have been remarkably successful. Many observers previously believed these conservation efforts would fail. Indeed, scientists attempting to save the black robin faced severe significant challenges.
First, black robins lack defenses against predators. Although black robins can fly, they do not fly particularly well, and they have no natural fear of predators. The black robin species evolved on isolated islands with very few or no predators and therefore did not develop defensive abilities. When humans later introduced mammalian predators, such as cats, these predators quickly eliminated most of the black robins, and the remaining birds seemed unlikely to survive.
Second, the highly specialized diet of black robins was also problematic. They feed on spiders, worms, and some insects. Because the population of these food sources varies naturally throughout the year, black robins had difficulty competing with numerous other species for the available food. So when they could not find enough food to feed themselves and their young, black robins became malnourished. This lack of nutrition weakened the birds, making them more likely to die.
Finally, black robins’ low rate of reproduction was another obstacle. Black robins normally reproduce only once per year, laying very few eggs. Even worse, the black robin population was so low at one point that there was only one fertile female left alive. This meant that the black robin population could increase only by a few birds at most each year. Even if scientists could resolve the birds’ other problems, the black robin’s low reproductive rate seemed likely to slow or even prevent their recovery.
学术写作：
Instructions: Your professor is teaching a class on self – care. Write a post responding to the professor’s question. In your response you should:
- express and support your personal 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 is structured; that is, it involves planning in advance 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 those approaches to spending time off from work or school you prefer and
Claire
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.
Paul
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 so I can complete both my work and my studies. So when I have time off from work and school, I just want to relax with no plan.
