人教版（2019）选择性必修1《Unit 2 Looking into the Future》2021年同步练习卷（词汇学习4 Step2）

Step 2 语篇提升训练Task 1 语法填空

• 1．Some scientists say there is growing evidence that yearly booster shots may not be needed to protect people against COVID-19.
      Vaccine （1）

  （develop） have been advising that the world will need yearly booster injections to remain protected.Vaccine producers have also suggested that new vaccines（2）

  （be） necessary to fight new virus versions，also （3）

  （call） variants.
      But these suggestions were disputed by more than 12 influential disease and vaccine development experts （4）

  recently spoke to Reuters news agency reporters.
      Some of the scientists expressed concern that public expectations around COVID-19 boosters are being set by drug company executives （决策者；行政主管）rather than health（5）

  （special）.Still，many agreed that preparing（6）

  such a need as a precaution was reasonable.
      The scientists fear that a push by（7）

  （wealth） nations for repeat vaccination as early as this year will （8）

  （deep） the divide with poorer countries that are struggling to buy vaccjye.aies.In some nations，it may take years （9）

  （vaccinate） their citizens even once.
      "We don't see the data yet that would inform a decision about（10）

  or not booster doses are needed，" said Kate O'Brien.She is director of the Department of Immunization，Vaccines and Biologicals at the World Health Organization （WHO）.
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