勤奮學習就是面對學習作業，能一絲不苟的完成;面對學習中的.困難，能積極找出困難的原因，勇於克服，不解決困難時不罷休。 以下是小編為大家搜尋整理的2017年專業英語四級聽力練習VOA常速，希望能給大家帶來幫助!更多精彩內容請及時關注我們應屆畢業生考試網!
Anti-Ebola Compounds Show Promise
While the West Africa Ebola epidemic is believed to be winding-down, the search for new treatments and vaccines is not. One study is a U.S./Serbian effort to find an effective anti-Ebola drug.
Last September, there were some dire warnings that West Africa Ebola cases could eventually number between 500,000 and one and a half million. Fortunately, that did not happen. But the biggest Ebola outbreak ever did infect about 27,000 people and killed more than 11,000. And after more than a year, it’s still not over. While Liberia has been declared Ebola-free, Sierra Leone and Guinea have not.
So health and government officials say better ways to prevent or contain another outbreak are very much needed. A number of vaccine trials continue and different drugs are being tested.
For example, the U.S. Defense Threat Reduction Agency and the Serbian Ministry of Science and Technical Development have provided funding to study a small class of molecules known as ial research shows that most of the mice “that received one of three experimental compounds survived infection and did not show any side effects.”
One of the researchers is Bogdan Solaja, professor of organic chemistry at the University of Belgrade. He said, “There are several chemo types, several classes of compounds which are actually today known to be active against Ebola. But from being active against Ebola to being a drug is a long, long way.”
Every step in researching a new drug, he said, is elementary.
“Our compounds, more or less, behave good in mice. I mean they cure some mice up to 90 percent as it is presented in this publication.”
The findings appear in the journal ACS Infectious Diseases.
But even though the results are very good, there’s more that needs to be known. Are these compounds toxic? Solaja said they are not. Can they cause changes in a patient’s body, affecting DNA, for example? Something called mutagenesis. The researcher said they know the answer, but cannot reveal it at this time.
“The compounds are water soluble as salts and they can be administered in [a] water solution. And that is quite good, although they are usually administered in [a] water / DMSO mixture,” he said.
DMSO – dimethyl sulfoxide – is a by-product of the wood industry and has been used as solvent. It’s been mixed with other substances to help them absorb faster.
Solaja said the goal is to have an Ebola drug that can be used the way HIV and malaria drugs are now administered.
“We want to have a drug which could be a prophylactic and which could treat the animal, which already got Ebola.”
HIV and malaria drugs are now used to prevent infection – and continue to be used if an infection has already occurred.
Despite the initial and very encouraging success, the professor said the drug will not be on the market soon.
“Average time from starting good results until market is about 10 years,” he said.
Solaja and his colleagues are working with researchers at Fort Detrick in the U.S. state of Maryland. It’s home to the Army Medical Research and Materiel Command and the former site of the U.S. biological weapons program. Some of the most dangerous organisms to humans are studied there in underground labs.
詞彙解析legislation
難度：3星常用詞彙，屬常用6000詞
英漢解釋
n.法律;法規;立法
參考例句
用作名詞 (n.)
The government will introduce legislation to restrict the sale of firearms.
政府將制定法規限制槍。
The conservationists will not take kindly to the legislation.
自然資源保護論者對這項立法不會做出善意的反應。
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export
難度：4星核心詞彙，屬常用3000詞
英漢解釋
n.輸出;出口;輸出品;輸出儲存器的資訊
v.輸出;出口;帶走，運走;從儲存器輸出資訊
參考例句
用作名詞 (n.)
Consultancy, insurance and tourism are also parts of the export trade.
諮詢,保險及旅遊也是出口貿易的一部分。
用作動詞 (v.)
The blood can also export waste products from the tissues.
血液還能從身體組織裡輸出廢物。
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workshop
難度：3星常用詞彙，屬常用6000詞
英漢解釋
n.工場;車間;研討會;講習班
參考例句
用作名詞 (n.)
The workshop has shut down and the workers are unemployed.
工廠關閉後工人失業了。
She is studying in a theatre workshop.
她正在戲劇講習班學習。
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textile
難度：3星常用詞彙，屬常用6000詞
英漢解釋
n.紡織品
參考例句
用作名詞 (n.)
He intends to retail textile goods.
他打算零售紡織品。
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cargo
難度：4星核心詞彙，屬常用3000詞
英漢解釋
n.貨物;船貨
參考例句
用作名詞 (n.)
The ship is discharging the cargo.
船正在卸貨。
This port handles 100 million tons of cargo each year.
這個港口每年貨物吞吐量達1億噸。
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regarding
英漢解釋
prep.關於;至於
參考例句
用作介詞 (prep.)
She said nothing regarding your request.
她對你的要求隻字不提。
I care about nothing regarding my future career.
至於未來,我一點兒也不關心。
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peak
難度：4星核心詞彙，屬常用3000詞
英漢解釋
n.尖端;山頂;頂峰
v.達到頂峰;使處於頂點
vi.消瘦
參考例句
用作名詞 (n.)
In Yersa I noticed a spike on the peak of the pyramid-shaped roof of a church.
在葉拉薩村,我發現一座教堂的金字塔屋頂的尖端有一顆尖釘。
用作動詞 (v.)
Primary school enrolment will peak this year.
今年國小入學人數將達到最高峰。
