A
COVID-19 vaccinations (接种) are underway. Anthony Fauci, director of the National Institute of Allergy and Infectious Disease, has said that approximately 75 to 90% of Americans will need to be vaccinated to reach herd immunity (群体免疫) in the United States. Public health experts recommended a staged approach to vaccination. Demand for the vaccine (疫苗) exceeded capacity in the beginning. Vaccine manufacturers ramped up production to meet the demand; however, public interest in getting vaccinated has been waning. The U.S. adopted the following staged approach, but by May 1, 2021, most of the country had already reached stage 2:
Stage 1a includes healthcare personnel and residents of nursing homes and assisted living facilities. Stage 1a vaccinations began in December 2020.
Stage 1b includes frontline essential workers: police officers; food and agricultural, postal, daycare, public transit, grocery store, public transit, and manufacturing workers; teachers; and people aged 75 and older. (Some states are allowing people 65 and older to register for the vaccine.) Some states began Phase 1b vaccinations during the second full week of January 2021.
Stage 1c includes people aged 65 to 74 and people ages 16 to 64 who have underlying health conditions that increase the risk of COVID complications. Essential workers of any age in the transportation, logistics, food service, construction, communications, information technology, energy, law, media, public safety, and public health sectors are also in Phase 1c. Many states were able to vaccinate Phase 1c in March and April.
Stage 2 includes all other people aged 16 and older. (A COVID-19 vaccine is now authorized for teens age 12 and older.)
1． When did healthcare personnel begin to get vaccinated?
A. May, 2021. B. December, 2020. C. January, 2021. D. March, 2021.
2． What does the underlined word in paragraph mean?
A. Increasing. B. Decreasing. C. Changing. D. Improving.
3． Which of the following statements is true according to the passage?
A. To reach herd immunity, more than 90% of Americans needed to be vaccinated.
B. Most states of America had already reached stage 1c by May 1, 2021.
C. In stage 1b a man aged 66 can get vaccinated in some states of America.
D. All people ages 12 and older will get vaccinated at the end of the staged approach.
