题型:阅读选择 题类:真题 难易度:困难
浙江省温州市2021年中考英语真题试卷
Most viruses can be found and killed by our immune system as soon as they enter our bodies. However, some viruses, for example, the coronavirus, are sneaky. They are difficult to recognize and find. These viruses can cause deadly diseases, like COVID-19. Human-to-human transmission can easily occur, and pandemic will therefore break out. Vaccination is by now a simple, safe and effective way to protect us from the diseases.
▲ Vaccines are something that "looks" exactly the same as the viruses, mainly made from the viruses that are weakened or killed. They will not make us really ill. They only stimulate and activate * our immune system to work, telling it something harmful is coming in. The immune system will know what the "viruses" look like, and send B cells(lymphocytes) or antibodies to find and kill them. Meanwhile B cells will remember them for the next kill. A vaccine may also give us passive immunity by providing B cells taken from an animal or a human to play the same role.
Scientists have developed more than 180 vaccines to fight against COVID-19. The technical approaches of these vaccines can be a little different, but their aims are the same.
Take the inactivated vaccine as an example. In an inactivated vaccine, the coronaviruses are already killed or made into the ones unable to produce more new viruses. When the immune system "sees" them, it will try to kill them. The question is: without enough these viruses• how can B cells remember them? That's why we need to take the vaccine more than one time. Though this vaccine is safe, it might not be as effective as it is expected to be.
The live-attenuated vaccine is different. In this vaccine, the viruses are weakened, but they are alive. They can produce enough new viruses to train the immune system to kill and remember them, so people only need to take the vaccine once. The live-attenuated vaccine is considered the most effective, but there is a worry: what might happen once these viruses wake up?
Therefore, although vaccination is by now one of the best ways to protect us from COVID-19, it can be better.
注意:1)内容必须包含提示的所有要点,可适当增加细节,使行文流畅。2)要求语句通顺、卷面整洁、书写规范,80个词左右。
优点(advantage) | 缺点(disadvantage) |
1. 快速搜索大量的有用的信息。 2. 广交朋友并能同他们面对面在线聊天。 3. …… | 1. 沉迷于网络游戏不利于学习。 2. 一些人利用网络伤害他人并通过欺骗获取钱财。 3. …… |
你的看法和做法(至少一点) |
warm, give, she, wait, arm, happy, when, worried, on, spend, night, play |
People always think that mother's love is the greatest love in the word. {#blank#}1{#/blank#}you are still a baby, mother takes good care of you as much as possible. In your waking hours(醒着的时候) , she always holds you in her {#blank#}2{#/blank#} . When you are ill, she stops her work right now to look after you day and {#blank#}3{#/blank#} and forgets about herself. When you are growing up day by day, she feels very {#blank#}4{#/blank#} . When you are old enough to go to school, mother still looks after you all the time. On cold winter days, she always tells you to put on {#blank#}5{#/blank#} clothes. She always stands in the wind and{#blank#}6{#/blank#} for you back from school. When you hurry to leave home for school with little breakfast, she always feels {#blank#}7{#/blank#} about you at home. She usually knows about your study and {#blank#}8{#/blank#} much money on your school things. When you do well at school, the brightest smile will be {#blank#}9{#/blank#} her face.
Mother is always ready to {#blank#}10{#/blank#} everything to her children, not to receive. What true love that is in the world! We will remember Mother's Love forever.
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