TPO21
综合写作：
孩子那些事Reading:
自字成语Genetic modifications, a process ud to change an organism's genes and hence its characteristics, is now being ud to improve trees. Through genetic modification, it is possible to create trees that produce more fruit, grow faster, or withstand adver conditions. Planning genetically modified trees on a large scale promis to bring a number of benefits.
纳瓦拉大学First, genetically modified trees are designed to be hardier than natural trees; that is, they are more likely to survive than their unmodified counterparts. In Hawaii, for example, a new pest-resistant species of payapa tree has been developed in respon to ringshot virus infections that have repeatedly damaged the native papaya-tree population. Planning the genetically modified papayas has largely put an end to the ringshot problem.
Moreover, genetically modified trees promi to bring a number of economic benefits to tho who grow then. Genetically modified trees tend to grow faster, give greater yields of food, fruit, or other products- and be hardier. This allows tree farmers to get faster and greater returns on their farming investment and save on pesticides as well. [hardy: resistant to cold, 耐寒]
Finally, the u of genetically modified trees can prevent overexploitation of wild trees. Becau of the growing demand for firewood or building timber, many forests around the world are being cut down faster than they can be replaced. Introducing genetically modified trees designed for fast growth and high yield in given geographic conditions would satisfy the demand for wood in many of tho areas and save the endangered native trees, which often include unique or rare species.
Lecture:
思考的近义词Sure, there are some benefits of planting genetically modified trees, but are the trees really as great as they first sound? When you examine the subject cloly, here are some 失眠2017
rious problems and costs associated with using genetically modified trees.
英语教学First, genetically modified trees may be resistant to one particular condition, but that does not necessarily ensure their survival. You e, a typical non-modified tree population is genetically diver. That means that, for most threatening conditions, for climates, incts and other pests, whatever, there will be at least some individual trees or any given species of trees that are resisted. So even if most of one kind of tree are killed, tho few resisted ones will survive and ensure the survival of that species of tree. But genetically modified trees are genetically much more uniformed, so if they are expod to an environmental challenge they have not been designed for, they will all die. So if the climate changes or a new pest invades the area, the genetically modified trees will likely be completely wiped out.
Now as the cond point, there are hidden costs associated with growing genetically modified trees. You e, the companies that genetically modified the trees tend to charge farmers much more for each ed than unmodified tree eds would cost. Also, as you've
学法用法考试grown the tree, you cannot collect the eds and plant a new tree for free. By law, you have to pay the company every time you plant.
And finally, genetically modified trees might actually cau even more damage to the local wild trees. You e, genetically modified trees are often grown more aggressively than natural trees do. And genetically modified trees are typically planted among natural trees. As a result, the genetically modified trees out compete the native trees for resources: sunlight, soil, nutrients and water, eventually crowding out the natural trees.
Integrated writing sample essay:
黄先生英文怎么写
The professor claims that there are rious problems and costs associated with planting genetically modified trees, challenging the view in the reading passage that planting genetically modified trees on a large scale promis to bring tremendous benefits.
First, the passage says that genetic modification is a good way to protect the trees against harsh natural conditions or possible infections becau they are designed to be h
ardier. However, the lecturer claims that genetic modification does not ensure their survival becau the trees are genetically more unified. So, if their genes are not designed for a particular condition, such as climate change or invasion of new pests, they might be eradicated altogether.
Second, the passage says that genetically modified trees tend to grow faster, give more fruits and therefore provide greater financial returns for the growers. However, the lecturer points out that this is not the whole picture, becau the eds of genetically modified trees are more costly and the law requires farmers to pay for the company for every genetically modified tree that is planted.
