解析 B 句意:由于新型冠状病毒仍在快速传播,接种疫苗是非常必要的。before在……之前;since由于;although尽管;unless除非。根据“ the COVID-19 is still spreading rapidly, getting a vaccine(疫苗) is quite necessary”可知,“新型冠状病毒仍在快速传播”是接种疫苗的原因,用since引导原因状语从句,故选B。
句意:由于 COVID-19 仍在迅速传播,接种疫苗是非常必要的。 考查连词辨析。 A. before 在……以前,引导时间状语从句; B. since 由于,引导原因状语从句; C. although 尽管,引导让步状语从句; D. unless 除非,引导条件状语从句。 分析语境可知,前半句是一个原因状语从句,空处表示“由于”。 故选:B。结果...
Toward a COVID-19 Testing Policy: Where and How to Test When the Purpose Is to Isolate Silent Spreadersdoi:10.2139/SSRN.3750676Ariel L RivasAlmira L HoogesteijnJames HittnerMarc Hv van RegenmortelPrakasha KempaiahParis VogazianosAthos Antoniades...
MOFA spokesperson: China is providing free COVID-19 vaccine assistance to 53 countries Share Error loading player: No playable sources found01:08 China is providing free vaccine aid to 53 countries around the world while overcoming its own difficulties, Foreign Ministry Spokesman ...
(COVID-19) testing at Collection Sites locations to cover viral detection by COVID-19 RNA testing and antibody tests for IgG and IgM. Effectively covering the full spectrum of COVID-19, infectious disease progression is crucial in identifying affected individuals at different stages of a possible...
If a batch tests negative for COVID-19, all those patients are cleared. If a batch tests positive, the specimens must be retested individually or in smaller groups. Such tests could be used to quickly clear groups of people who are not likely carriers, such as ...
The Covid-19 global pandemic is the most extensive to afflict humanity in a century. A serious crisis for the entire world, and a daunting challenge, it poses a grave threat to human life and health. 这是一场全人类与病毒的战争。面对前所未知、突如其来、来势汹汹的疫情天灾,中国果断打响...
Although COVID-19 remains a threat, many countries are considering reopening schools and public places. But is it really safe right now for kids to play outside? Unfortunately, it's still not 100 percent safe outside, as many places around the world are still r...
Usually in the season there will be a frequent occurrence of cold and flu. Not all symptoms are necessarily caused by COVID-19. What if it is? Then isolate yourself at home, wear a mask and avoid contact with people around you. I don’t think that’s too difficult. If people around...
What is the new app service aimed at? A. Evaluating the risks of infecting COVID-19. B. Confirming whether one has infected the virus. C. Warning people of potential risks of traveling. D. Informing people of increased death number. ...