JH_002
综合写作
听力音频：
Yellow-legged mountain frogs live in the Sierra Nevada mountains in California in the western United States. They live around sunny streams and lakes at high altitudes. Over the last 40 to 50 years, populations of the yellow-legged mountain frog have been declining, and it is now considered an endangered species. Researchers have suggested several theories about what may have caused the population decline.
Nonnative Trout
Some researchers have suggested that the problem is the introduction of trout (a species of fish) into water sources in the Sierra Nevada mountains. The trout were introduced to encourage recreational fishing, but they may be causing the frog decline. Trout are predatory fish that can feed on tadpoles (young frogs). Since trout are not native to the region, yellow- legged mountain frog tadpoles have not developed any defensive behaviors that would protect them from the trout.
Pesticides
Others believe that chemical pesticides sprayed onto farm fields could be poisoning frog habitats and harming frog populations. To the west of the Sierra Nevada mountains lies California’s Central Valley, a region with some of the most intensive agriculture in the United States. Pesticide use in the Central Valley is heavy, and it is possible that some amount of the pesticide contaminates the freshwater habitats of the yellow-legged frog.
Fungal Disease
In recent years, a fungal disease called chytridiomycosis has been reducing or even wiping out frog populations in many areas around the world. Chytridiomycosis typically attacks the skin; a frog’s skin is essential to many of its vital functions, including breathing and water intake. The fungus that causes chytridiomycosis has been found in the Sierra Nevada mountains, and it is quite possible that it is to blame for the decline of the yellow-legged mountain frog populations there.
Question:Summarize the points made in the lecture, being sure to explain how they respond to the specific concerns expressed in the reading passage.
学术写作：
教授：新公司应该请更有经验的员工还是无经验的大学毕业生？
Claire：有经验的
Paul：无经验的
Doctor Achebe: We’ve been talking about the process of starting a newbusiness. One of the most important aspects of theprocess is staffing- that is, deciding which people tohire. Please discuss the following question: is it bettelfor new businesses to hire experienced veterans of theindustry or to staff the business with younger employeeswho are right out of university? Why do you think so?
Claire: I think a company should staff a business with the most experienced employees possible. If you’re starting a new business, you need people around you who know what they are doing and can quickly get the business up to speed. Spending time training inexperienced people will slow you down.
Paul: I understand what Claire is saying, but if you are starting a new business, you want people whoare particularly enthusiastic and energetic. Who better than a recent graduate to bring those qualities to the job? You would be guaranteed an ambitious hard worker.
答案请付费后查阅：
