综合写作：
It has long been assumed that dinosaurs, like today’s reptiles, were cold – blooded. In other words, a dinosaur’s body temperature was thought to equal that of its environment. Recently, however, a number of scientists put forward a suggestion that dinosaurs were in fact warm – blooded animals that maintained a constant body temperature, and they support this new theory with several arguments.
First, the ability of dinosaurs to dominate the warm – blooded mammals during the millions of years the two groups coexisted on Earth suggests that dinosaurs enjoyed the physiological advantages of being warm – blooded. For example, warm – blooded animals tolerate cold temperatures much better and use energy from food much more efficiently than cold – blooded animals. Had the dinosaurs been cold – blooded, it is hard to imagine how they could successfully compete with the mammals, much less dominate them.
Second, since warm – blooded animals have more surplus energy than cold – blooded ones, they typically care for their young much more extensively. Fossil remains of dinosaur nests provide evidence of highly developed parental care. The nests contain remains of very young dinosaurs, indicating that young dinosaurs grew up in the nest and were fed by their parents. Furthermore, the nests contain very small fragments of eggshells, which suggests that the young stayed in the nest long enough to break the eggshells into small pieces as they trampled on them. All this evidence points to the conclusion that the young dinosaurs received a lot of parental care, which is a typical feature of warm – blooded animals.
Third, fossil evidence suggests that dinosaurs may have regulated body temperature by developing hair – and feather – like outer structures similar to those used by birds and mammals. No cold – blooded animal today has such coverings. Since many dinosaurs appear to have grown hair and feathers, dinosaurs must have been warm – blooded like the animals that grow them today.
学术写作：
Instructions: Your professor is teaching a class on entrepreneurship. 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
We’ve been discussing business strategies and the attitudes of businesspeople toward risk and opportunity. The scientist Albert Einstein once said that a person who never made a mistake never tried anything new. He was probably referring to physics, but I wonder how this attitude might apply to the business world. Do you think it is a good business strategy to take continual risks even though negativity result in mistakes that could affect a company?
Paul
I think this strategy can easily backfire on a businessperson. I’ve seen companies conduct endless cycles of product enhancements in an effort to capture some other market share. But in reality, they just damage their own brand by sacrificing too much of the original content that made the product popular in the first place.
Claire
I disagree with Paul. Most profitable businesses have used this strategy, or they would have never made it to the top. If you try to grow a business aggressively, some mistakes along the way are inevitable. Too much caution or too much emphasis on avoiding mistakes can really prevent growth.
