题型:阅读理解 题类:模拟题 难易度:普通
黑龙江省齐齐哈尔市2021届高三下学期英语第三次模拟试卷
This week, four COVID-19 vaccines have appeared highly effective in preventing the COVID-19 disease and will roll out to market soon.
On November 17, Sinovac, a Chinese biotech company, published its promising results from Phase(阶段)1 and 2 trials in the medical journal The Lancet. The data shows that the vaccine, Corona Vac, has produced a very quick and strong immune response and did not cause any severe side effects among the 700 people tested. Sinovac has already started the Phase 3 tests in UAE, Brazil, Indonesia and Bangladesh since July 3. Initial Phase 3 data is likely to be available within the next month. (Update: the Phase 3 tests in UAE have shown that Corona Vac is 86% effective and UAE has officially approved it for nationwide use.)
One day earlier, Moderna reported that its vaccine is 94% effective and strongly protects against serious COVID-19 illness. On November 18, Pfizer announced that its vaccine is 95% effective. Britain's Oxford-AstraZeneca group said on November 23 that its vaccine is up to 70% effective.
However, Corona Vac may have a series of potential advantages over the mRNA vaccines produced by Moderna and Pfizer and Oxford-AstraZeneca group's DNA vaccines, since there hasn't been any mRNA or DNA vaccines approved by the Food and Drug Administration (FDA) before, while Corona Vac is based on a tried-and-true method that uses weakened or dead COVIE-19.
Another big advantage for Corona Vac is the storage temperature as it can be stored between 2℃ and 8℃ for up to three years, while the mRNA vaccines have to be kept between -20℃ and -70℃. It would make their storage and distribution really challenging, especially in the developing countries.
Although we are seeing lights by the end of the tunnel, it's important to remember that an effective vaccine is not enough to end the crisis quickly, because it will take months to produce enough vaccines and distribute them. Therefore, measures like social distancing, washing hands and wearing face masks will remain essential to control the spread of COVID-19.
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