——样品。 考查冠词。a一个,表泛指,用于读音以辅音音素开头的字母或单词前;an一个,表泛指,用于读音以元音音素开头的字母或单词前字母;the那个,表特指。第一空,泛指一个字母,s读音以元音音素开头,故第一空用an;第二空特指上文提到的那个字母,用定冠词the。故选C。
Covidization of research: what are the risks? (vol 26, pg 1159, 2020)An amendment to this paper has been published and can be accessed via a link at the top of the paper.Pai, MadhukarNature medicine
Hochman said data shows masks are effective at reducing the odds of contracting COVID or spreading it to others, but she believes that people should assess their own risk tolerance when it comes to wearing masks in public. "I think it's really up to the individual and how much wha...
What are the symptoms of coronavirus? What can you expect with COVID variants? Fever, fatigue and dry cough; nasal congestion, runny nose and sore throat; diarrhea; and shortness of breath are signs of infection.
What are the signs, symptoms and stages of COVID-19, and what causes death in COVID-19? How long do you spend in the ICU with COVID-19? How long do you have COVID-19 before you die?Official answer by Drugs.com What are the stages and symptoms of COVID-19? Day 1: The ...
The previous “traditional” symptoms, such as loss of smell (anosmia), shortness of breath, and a fever, are much less common these days. In the list of common symptoms, anosmia ranks 14th, and shortness of breath ranks 16th. Anosmia used to be a key indicator of COVID-19, but only...
(E)COVID-19(新冠肺炎) is spreading all over the world. What should we do to prevent the virus(病毒) from spreading(传播)? Here are the suggestions.First, we should seldom go out. It's easier to get sick outside. When we have to go out, we must wear masks(口罩). Second, we ...
Are they safe? Credit: Unsplash/CC0 Public Domain As the COVID virus continues toevolve, so does our vaccine response. FromDecember 11, Australians will have access tonew vaccinesthat offer better protection. These "monovalent" booster vaccines are expected to be a better match for currently ci...
)31.serious COVID-19(新型冠状病毒肺炎) is ! But we will beatit at last.A.WhatB. What aC.HowD. How a 答案 31.C【解析】考查感叹句的用法。句意:新型冠状病毒肺炎多么严重啊!但是我们最终会打败它。感叹句结构为:What+a/an+形容词+可数名词单数(+主语+谓语);What+形容词+不可数名词或可数名词...
Long COVID的表现 据报道有31%-69%的COVID-19患者在感染恢复后出现Long COVID,其最常见的症状包括:疲劳、肌肉疼痛、心悸、认知功能障碍、呼吸困难、焦虑、胸痛和关节痛等。进一步的症状学研究发现,Long COVID可表现出呼吸、心血管、神经系统、肾脏、内分泌、消化等多个系统的...