https://ed.ted.com/ 传统疫苗的研发需要漫长的时间,新冠疫苗为何在短短一年之内就能问世?其背后的秘诀就在于一项已研究了数十年的医学技术——信使核糖核酸。它究竟是何方神圣?它的防疫原理又是什么?来本片中寻找答案吧~~请务必记住:疫苗是拯救生命的,只有恐惧才会危及生命!【p.s.】校对并且附加了英语字幕,...
How long to quarantine after a positive COVID-19 test? The CDC define the difference between quarantine and isolation as: Quarantine: You need to be in quarantine when you have been exposed to the virus and you may or may not be infected. Isolation: You need to isolate when you are infe...
解析 A [解析] [详解] 句意:——新冠肺炎疫情多久能在世界范围内得到控制?——没人知道。 考查特殊疑问词。How soon多久之后;How long多长时间;How far多远;How often多久一次。根据“...will the COVID-19 be controlled in the world”可知此处询问多久之后才能控制COVID-19,疑问词用how soon。故选A。
COVID-19导致美国各地的学校和公共图书馆关闭,弗吉尼亚州的一位图书管理员想到了用无人机将图书送到孩子家门口,让孩子免费阅读,享受阅读的乐趣。【小题1】考查形容词词义辨析。句意:然而,弗吉尼亚州的一位图书管理员想出了一个让孩子们免费阅读的创意方法。A. average普通的;B. easy容易的;C. creative有创造力...
COVID-19 precautions taken in 2020 disrupted efforts to eliminate several neglected tropical diseases by 2030, which could delay some regions from
China has recently approved more than 10 kinds of COVID-19 antigen self-test kits. The National Health Commission suggested that three groups of people should use them: 1. People who develop symptoms within five days. 2. People in quarantine, such as close contacts of COVID-19 patients,...
他表现出了多大的勇气啊!考查感叹句。感叹句有两类:1.What+(a/an)+形容词+名词+主语+谓语!2.How+形容词(副词)+主语+谓语!根据空后:great(形容词)+ courage(不可数名词)可知,空处应是what引导的感叹句,且courage,勇气,不可数名词,故不加冠词a。故填D。
In many ways, the COVID-19 pandemic has proven to be a moving target.Facedwith(面对)stopping a pandemic scientistshave yet to(还没有)fully understand, researchers simply can’t guarantee what lies ahead—or when life w...
根据COVID- 19(新冠肺炎)is breaking out around the world now"新冠肺炎现在在世界各地爆发"可知,它"扼杀"了我们重返学校的机会。用kills。故选:A.--新冠肺炎现在在世界各地爆发。--太可怕了!它扼杀了我们重返学校的机会。动词是表示动作或者是状态的词,要结合语境,辨析选项动词意思,选择合适答案完成试题。
and the deaths and hospitalizations," he says. And this reflects vaccination rates against SARS-CoV-2, thecoronavirusthat causes COVID-19 in more vulnerable populations. "The vaccination was protecting the people that were the most at risk," he says. "Those vaccines are working like a charm....