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utdoHundreds of millions have rolled up their sleeves for the COVID-19 vaccy Dcc.29tohe omer of people vaccinated had reached 1.259 billion,cvering37percent ofwChina's population.Why haven'tthey roed up their pants legs instead?Why doemost shots in our arms?What's the science behind why we get most vaccines in our arm?It'sworth noting that most,but not all,vaccines are injected into muscles.yMuscle tissue contains important immune cells.These immune cells recognize the antigen,aistiny piece of virus or baeteria introduced by the vaccine that stimulates an immune response.Inutthe case of the COVID-19 vaccine,the immune cells in the muscle tissue pick up these antigensesand present them to the lymph nodes ()As key parts of our immune system,lymph nodesiscontain more immune cells that recognize the antigens in vaccines and start the immune process ofncreating antibodies.Since the deltoid (is close to lymph nodes located under the amm,itis the perfect choice for many vaccines,according to The Conversation.Muscles can save you from getting a red rash and swelling up."Muscle helps localize anynegative reactions and minimize them,so it's safer,"Joanna Groom,an immunology researcherin Australia,told ABC News.If certain vaccines are injected into fat tissue,the chance ofinflammation ()reaction increases.Fat tissue has poor blood supply,which leads to poorabsorption of the vaccine,according to The Conversation.Muscle size should also be taken into consideration.Usually,adults and children aged 3 andolder tend to receive vaccines in their deltoid,while younger children are recommended to receivetheir vaccines in their mid-thigh because their arm muscles are smaller and less developed.Thank your deltoid for being the ideal spot for vaccinations.Can you imagine pulling downyour pants at a mass vaccination clinic?Rolling up your sleeve is the easier and preferred way tog0.32.How does the author bring up the topic?A.By raising questions.B.By giving an example.C.By making a comparison.D.By explaining statistic data.33.Why are vaccines injected in our upper arm muscle?A.The muscle tissue contains the most immune cells.B.The lymph nodes stimulate an immune response.C.It is easier for immune cells to recognize the antigen.D.The location of the deltoid makes it easier to create antibodies.英语试题第8页（共12页）