综合写作：
ETS TOEFL
Writing | Question 1 of 2
Since the common carp was introduced to Australian waters about two centuries ago, it has become an invasive species in many Australian waterways, where it competes with native fish and harms local ecosystems. Scientists are currently investigating several methods for reducing carp numbers in order to improve ecosystems in Australia.
First, it is possible to reduce carp populations through commercial fishing. In the United States, for instance, the Asian carp has been a harmful invasive species for many years, but its numbers have been reduced in several areas by increased commercial fishing. This occurred because government programs encouraged commercial fisheries to catch and sell more carp and because carp was promoted as a fish that is especially good to eat. Commercial carp fishing could similarly be encouraged in Australia to reduce carp populations.
Another option is to poison the carp. Bait food injected with a powerful toxin can be thrown into lakes and ponds; carp that eat these baits will die. To keep native fish species from being killed by these poisoned baits, they can be made attractive only to carp. Unlike many fish, carp can eat plants and are attracted to certain kinds of plant material, like corn. So, if the poisoned baits are made of corn or resemble corn, they will only get eaten by the carp, and only the carp will get killed by the poison.
A final option involves genetic engineering. In the laboratory, scientists have found a way to modify or change individual carps’ genes so that they only produce male offspring, without producing females. Scientists hope to introduce such genetically modified carp into the infested waterways, where they will breed with the carp that are already present. As these modified carp spread their genes throughout the carp population, carp offspring will increasingly be male, reducing the number of carp eggs that get produced.
学术写作：
Your professor is teaching a class on business management. 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
Let’s continue talking about consumer behavior. We have been discussing different ways people go about choosing what products to buy, and there are many potential sources of information and advice for consumers. In your opinion, which is the better strategy for making purchasing decisions, relying on advice from friends and family, or depending on information from online sources?
Claire
Asking friends and family members for product recommendations might seem like an easier option, but it might take too much time to get all the information you need. An internet search would be much more efficient. There are many consumer magazines available online that compile lots of data to compare the advantages and disadvantages of one product versus another.
Paul
The last time I bought a computer, I just watched a few videos online to make a decision, and now I regret that. My friends could have advised me better because they know my preferences and the kind of features that I am interested in. Consumers should get advice from the people around them to find the most suitable products.
