【答案】B 【详解】 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。before 在...以前, 引导时间状语从句;since 由于,引导原因状语从句; although 尽管,引导让步状语从句;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。 反馈 收藏...
As debates about booster shots heat up, what's known about the duration of vaccine-based immunity is still evolving.#As debates about booster shots heat up, what's known about the duration of vaccine-based immunity is still evolving.
The Food and Drug Administration's scientistsconfirmedthat overall the vaccine is about 66% effective at preventing moderate to severe COVID-19. The agency also said J&J's shot — one that could help speed vaccinations by requiring just one dose instead of two — is safe to use. However, J...
考查从属连词辨析。As soon as-...就...;Since由于;Although尽管;So that 以便。根据“getting a vaccine (疫苗) is quite necessary.”可知注射疫苗是非常有必要的,因此新冠肺炎正在迅速传播,因此应用since 引导原因状语从句。故选B。 反馈 收藏
This is a situation in which ironically there's been a lot of discussion in the popular press about the race for the vaccine – who's going to be first to develop a vaccine. A race is the wrong metaphor. A gold medal on a race is something that only one p...
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。
"I do think that there is emerging evidence that someone with prior COVID infection may be able to achieve sufficient immunity with just a single dose of a two-dose vaccine regimen," said Dr. Amesh Adalja, a senior scholar with the Johns Hopkins Center for Health Security in Baltimore. ...
At its next meeting, in October, the committee is likely to urge vulnerable people to get a second dose of the same COVID vaccine in the spring, for protection against the next summer wave, he said. If you're in a vulnerable population and waiting to get vaccinated until ...
The whole world is waiting for a vaccine (疫苗) to prevent COVID-19. Because of this, scientists from 172countries and regions, including China, Canada, Japan and the UK, are working together through the COVAX (新冠疫苗全球获得机制).COVAX is organized by the World Health Organization (WHO)...
There’s not enough data to discuss the possibility of an extra dose of Johnson & Johnson’s one-shot Covid-19 vaccine, the FDA said. The CDC said patients and doctors should decide who needs an extra dose and what the timing of that dose should be. No prescription or doctor’s note...