桂林雅思写作培训班,雅思.桂林雅思培训,桂林出国语言培训,雅思辅导班、雅思备考,桂林环球雅思经典格言:天才就是无止境刻苦勤奋的能力。——卡莱尔。
桂林环球雅思培训课程:
雅思基础(保
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雅思精品(6分)班
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6.5分高分班(选修外教口语)
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雅思mini精英班
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雅思“6分无限时”班
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高中生雅思“6段式”
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6.5分高分(选修词汇或语法)
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“4+1”式预备a套餐班
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“4+1”式预备b套餐班
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雅思狂人写作系列课程
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海外求生口语班
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雅思全真语法课
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雅思外教口语集训课程
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“四大名教”精讲点题班
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r1(高分级) r2(强化级)课程
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雅思语法提高班
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桂林雅思写作培训班,雅思.
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r3(预备级+强化级)课程
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雅思全真词汇班
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雅思强化(6分)班
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桂林雅思培训,桂林出国语言培训,雅思辅导班、雅思备考,桂林环球雅思经典格言:一般人的生活是什么,就是身边擦肩而过n位身怀批量版《九阴真经》《葵花宝典》《辟邪剑谱》的高人,都得不到一句"小兄弟我看你根骨清奇,拯救世界的艰巨任务就交给你了",而虎人的人生是什么,就是被这些高人哭着喊着抱大腿,声泪俱下,祈求虎人收下他们做便宜师傅,怎么打骂都撵不走。桂林雅思写作培训班,雅思.。
桂林雅思写作培训班,雅思. 雅思模拟试题在雅思备考过程中所起的作用不可小觑,通过模拟练习题,我们可以很直接地了解到自己的备考状况,从而可以更有针对性地进行之后的复习。希望以下内容能够对大家的雅思备考有所帮助!
Thursday January 11, 2007
The Guardian1. British scientists are preparing to launch trials of a radical new way to fight cancer, which kills tumours by infecting them with viruses like the common cold.
2. If successful, virus therapy could eventually form a third pillar alongside radiotherapy and chemotherapy in the standard arsenal against cancer, while avoiding some of the debilitating side-effects.
3. Leonard Seymour, a professor of gene therapy at Oxford University, who has been working on the virus therapy with colleagues in London and the US, will lead the trials later this year. Cancer Research UK said yesterday that it was excited by the potential of Prof Seymour's pioneering techniques.
4. One of the country's leading geneticists, Prof Seymour has been working with viruses that kill cancer cells directly, while avoiding harm to healthy tissue. "In principle, you've got something which could be many times more effective than regular chemotherapy," he said.
5. Cancer-killing viruses exploit the fact that cancer cells suppress the body's local immune system. "If a cancer doesn't do that, the immune system wipes it out. If you can get a virus into a tumour, viruses find them a very good place to be because there's no immune system to stop them replicating. You can regard it as the cancer's Achilles' heel."
6. Only a small amount of the virus needs to get to the cancer. "They replicate, you get a million copies in each cell and the cell bursts and they infect the tumour cells adjacent and repeat the process," said Prof Seymour.
7. Preliminary research on mice shows that the viruses work well on tumours resistant to standard cancer drugs. "It's an interesting possibility that they may have an advantage in killing drug-resistant tumours, which could be quite different to anything we've had before."
8. Researchers have known for some time that viruses can kill tumour cells and some aspects of the work have already been published in scientific journals. American scientists have previously injected viruses directly into tumours but this technique will not work if the cancer is inaccessible or has spread throughout the body.
9. Prof Seymour's innovative solution is to mask the virus from the body's immune system, effectively allowing the viruses to do what chemotherapy drugs do - spread through the blood and reach tumours wherever they are. The big hurdle has always been to find a way to deliver viruses to tumours via the bloodstream without the body's immune system destroying them on the way.
10. "What we've done is make chemical modifications to the virus to put a polymer coat around it - it's a stealth virus when you inject it," he said.
11. After the stealth virus infects the tumour, it replicates, but the copies do not have the chemical modifications. If they escape from the tumour, the copies will be quickly recognised and mopped up by the body's immune system.
12. The therapy would be especially useful for secondary cancers, called metastases, which sometimes spread around the body after the first tumour appears. "There's an awful statistic of patients in the west ... with malignant cancers; 75% of them go on to die from metastases," said Prof Seymour.
13. Two viruses are likely to be examined in the first clinical trials: adenovirus, which normally causes a cold-like illness, and vaccinia, which causes cowpox and is also used in the vaccine against smallpox. For safety reasons, both will be disabled to make them less pathogenic in the trial, but Prof Seymour said he eventually hopes to use natural viruses.
14. The first trials will use uncoated adenovirus and vaccinia and will be delivered locally to liver tumours, in order to establish whether the treatment is safe in humans and what dose of virus will be needed. Several more years of trials will be needed, eventually also on the polymer-coated viruses, before the therapy can be considered for use in the NHS. Though the approach will be examined at first for cancers that do not respond to conventional treatments, Prof Seymour hopes that one day it might be applied to all cancers.
(665 words)桂林雅思写作培训班,雅思.桂林雅思培训,桂林出国语言培训,雅思辅导班、雅思备考,桂林环球雅思经典格言:片刻可以改变一天,一天可以改变一生,一生可以改变世界。。
雅思考试备考课程 25年培训经验,桂林雅思培训,桂林出国语言培训,雅思辅导班、雅思备考,桂林环球雅思经典格言:请君试问东流水,别意与之谁短长。(唐·李白·金陵酒肆留别)桂林雅思写作培训班,雅思.。