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1
Jack Dorsey is stepping down as CEO of Twitter, the social media company he co-founded in 2006. He will be replaced by Twitter's chief technology officer, Parag Agrawal, a 10-year veteran of the company.
Twitter stock rose on the news, which was first reported by CNBC.
"I've decided to leave Twitter because I believe the company is ready to move on from its founders," Dorsey said in a statement. "My trust in Parag as Twitter's CEO is deep. His work over the past 10 years has been transformational. I'm deeply grateful for his skill, heart, and soul. It's his time to lead."
Dorsey will remain on the company's board of directors until May of next year. He was Twitter's founding CEO but left the company once before after a falling out with a fellow co-founder. He returned to the top job in 2015.
解析：杰克·多尔西将辞去社交媒体公司推特(Twitter)首席执行官一职。接替他的将是Twitter的首席技术官帕拉格·阿格拉瓦尔(Parag Agrawal)，他在Twitter工作了10年。阅读时注意文中时态、语态等语法知识点的运用。
2
Scientists in South Africa now have evidence that the omicron variant of the coronavirus spreads more than twice as quickly as the delta variant in that country.
"This wave seems much faster than the delta wave. And we thought the delta wave was really fast. It's unbelievable," says Juliet Pulliam, who directs South Africa's DSI-NRF Centre of Excellence in Epidemiological Modelling and Analysis at Stellenbosch University.
The analysis, presented at a scientific conference Friday, suggests the omicron variant is highly transmissible and also more capable of evading the immune system than delta.
"It looks like it may be more transmissible than delta," says Pulliam, who led the analysis. "There's a huge amount of uncertainty in the analysis, but I would say it looks likely."
On Thursday, Pulliam and her colleagues also published a study online showing that reinfections are more likely with omicron than with the delta or the beta variants. The study couldn't estimate the magnitude of this change — that is, how much more likely reinfections will be — but it shows quite strongly that this new variant is more capable of bypassing antibodies generated by a prior infection than previous variants.
解析：南非的科学家现在有证据表明，冠状病毒的奥密克戎变异在该国的传播速度是delta变种的两倍多。这项研究无法估计这种变化的程度——也就是说，再感染的可能性有多大——但它相当有力地表明，这种新变异比以前的变异更有能力绕过以前感染产生的抗体。阅读时注意定语、宾语等从句用法。
3
The war of words between NATO and Russia over Ukraine is reaching another highpoint — with Russian troops massing at the Ukrainian border.
U.S. Secretary of State Antony Blinken met with his Russian counterpart Sergey Lavrov on Thursday in Stockholm. NATO has threatened Russia with sanctions over a buildup of Russian troops at the Ukrainian border.
解析：随着俄罗斯军队在乌克兰边境集结，北约和俄罗斯之间的口水战达到了另一个高潮。
4
Coffee and tea drinkers had lower risks of dementia and stroke, according to a study published in Plos Medicine in November 2021.
This study involved 365,682 participants aged 50 to 74 years from the UK Biobank.
During an 11.4-year follow-up, 5,079 subjects developed dementia, and 10,053 participants had a stroke.
The researchers found that coffee intake of 2-3 cups a day or tea intake of 3-5 cups a day, or their combined intake of 4-6 cups a day, were linked with the lowest risk of dementia and stroke.
The focus of the investigation was the association, not cause and effect, between coffee and tea consumption with stroke and dementia.
Factors that could influence the outcome, such as weight, diet, and smoking, were controlled.
解读：根据2021年11月发表在《公共科学图书馆·医学》上的一项研究，喝咖啡和茶的人患痴呆症和中风的风险更低。
最后想说的是，经过这段时间的阅读，相信小伙伴们应该对新闻体裁文章的语境有所熟悉，祝你在12月18日的四六级考试中听力听得清清楚楚，阅读做得得心应手，取得理想成绩哈！
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