To help protect people against the novel coronavirus （新冠病毒），scientists have created vaccines （疫苗）.These days，people who are between 3 and 59 can get vaccinated （接种疫苗）.Here is something about vaccines.
There are many different ways to make vaccines.At least 115 different vaccines for the novel coronavirus are being developed around the world right now.Many of them may not work or may have influences that can be dangerous.That is why testing is very important.
Before a vaccine is ever tested on humans，it's first tested on animals to make sure it seems safe.Testing the vaccine on humans is done in several different periods.In Period （阶段） 1，a small group of people are given small amounts （数量） of the vaccine to see if it has any bad influences.Period 2 still tests the vaccines safety，but it's mainly a test to see if the vaccine seems to work.If Period 2 goes well，the vaccine can begin Period 3.During Period 3，the vaccine is tried on a much larger group of people to see how well it works.
The novel coronavirus is very serious and it influences the whole world.There is huge pressure to develop a working vaccine quickly.It normally takes seven or more years to develop a safe vaccine that works well.Luckily，this time，developing the vaccine against the novel coronavirus doesn't need so long，scientists have created it.
Thanks to the scientists，we can get vaccinated so soon.All of us believe that we can overcome the novel coronavirus completely.
（1）Who has created vaccines to help protect people against the novel coronavirus？ Scientists.Scientists.
（2）Is testing important before using the vaccines？ Yes，it is./Yes.Yes，it is./Yes.
（3）How many periods must be done to test the vaccine on humans according to the passage？ Three./3.Three./3.
（4）How long does it normally take to develop a safe vaccine that works well？ It normally takes seven or more years.It normally takes seven or more years.
（5）What is the passage mainly about？ It's mainly about vaccines./Vaccines.It's mainly about vaccines./Vaccines.
【答案】Scientists.；Yes，it is./Yes.；Three./3.；It normally takes seven or more years.；It's mainly about vaccines./Vaccines.
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声明：本试题解析著作权属菁优网所有，未经书面同意，不得复制发布。
发布：2024/5/7 8:0:9组卷：4引用：2难度：0.5
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