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The research for a COVID-19 vaccine(疫苗) for children is only just beginning. Some doctors are worried they may not know if any vaccine works for young children in time for the next school year.

Older adults may be most at risk from the coronavirus(冠状病毒), but ending the COVID-19 will require vaccine for children, too. Last week, a company was allowed to test its vaccine in U.S. children as young as 12 years old. It is one of only a few tests around the world to consider if any of the vaccines made for adults also can protect children.

"I just thought the more people they have to do tests on, the quicker they can put out a vaccine and people will be safe and healthy," said 16-year-old Katelyn Evans. She became the first teenager to get in the test.

Several possible vaccines are in studies in tens of thousands of adults. Scientists hope they will make sure that some of them are safe and useful enough for widespread use. But when the first vaccines are ready, they are impossible to be allowed for children. Vaccines cannot be given to youngsters unless they have been tested in their age group. This is a big problem to reopen schools and restart other activities.

"The public doesn't understand that," said Doctor Evan Anderson. He has been pushing for COVID-19 vaccine tests for children. While Anderson is pleased by the study in teenagers, he finds it "very worrying" that children younger than 12 may not have a vaccine by a year from now.

1.Who may be at the most risk from the coronavirus？

A The older adults.

B The young adults.

C The teenagers.

D The under 12-year-olds.

解析：选A。细节理解题。根据文章第二段Older adults may be most at risk from the coronavirus可知，老年人可能是最容易感染冠状病毒的人群，故选A。

2.What can we know about Katelyn Evans?

A She asked more people to do the test of vaccine.

B She became the youngest doctor in United States.

C She was the first teenager to pass the Chinese test.

D She was the first teenager to get the test of vaccine.

解析：选D。细节理解题。根据第三段She became the first teenager to get in the test.可知，她成为第一个参加疫苗测试的青少年，故选D。

3.Why can’t the first vaccines be given to teenagers when they are ready?

A Because they are too expensive.

B Because they haven’t been tested in teenagers.

C Because there are not enough vaccines for teenagers.

D Because teenagers don’t need the vaccines at all.

解析：选B。推理判断题。根据第四段Vaccines cannot be given to youngsters unless they have been tested in their age group.可知，除非在他们的年龄组中进行了测试，否则不能给青少年接种疫苗。因此推断疫苗没有在青少年中进行测试，就不能被使用，故选B。

4.What is Doctor Evan Anderson worrying?

A The research for a COVID-19 vaccine didn’t begin.

B Few adults took part in the test of COVID-19 vaccine.

C Children under 12-year-olds may not have a vaccine in a year.

D The public doesn't understand the importance of the vaccines.

解析：选C。细节理解题。根据最后一段he finds it "very worrying" that children younger than 12 may not have a vaccine by a year from now.可知，他发现“非常令人担忧”的是，12岁以下的儿童从现在起一年后可能无法接种疫苗，故选C。

5.What’s the main idea of the passage?

A The COVID-19 is still spreading quickly.

B A company was allowed to test its vaccine in the U.S.

C More research for a vaccine for children are needed.

D Several kinds of COVID-19 vaccines will be ready in a year.

解析：选C。主旨大意题。本文主要讲述了由于在新冠病毒疫苗的研制中，针对青少年或儿童的研究测试才刚刚起步，还需要更多测试，故选C。