题干

请你根据以下材料写一段100字左右的科普文字,帮助惊慌的人们正确对待疫苗的接种。

      2016年3月,山东警方破获案值5.7亿元非法疫苗案,疫苗未经严格冷链存储运输销往24个省市。问题疫苗含25种儿童、成人用二类疫苗。此次事件引起了全国范围的疫苗恐慌情绪,有些人甚至决定从此放弃为孩子接种疫苗。

疫苗


疫苗冷链管理制度

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答案(点此获取答案解析)

疫苗分两类。一类疫苗由政府垄断生产并免费提供给公民。二类疫苗为公民自费接种的其他疫苗。山东非法疫苗案所涉为二类疫苗,接种一类疫苗者无需担忧。经严格冷链存储运输的有效疫苗可增强人体防御能力。而未冷藏运输的疫苗就会失效,无法对人体产生免疫保护,但是没有毒性。

同类题5

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。

    As the saying goes, rose given, fragrance in hand. I am always in the 1 of giving money to every beggar or homeless person I pass by. My friends say it is not good to 2. We may come across beggars or homeless people begging every day and all beggars have their ability to survive. It 3 them that I never listen.

    On a 4 day, my friend and I were walking to the 5 when I passed a beggar lady. I had seen her several times before and had always given her a few 6. That day, I gave her 2 Euros. I was waiting for the bus and reading a book when I7 to see that lady standing in front of me. She 8 me a piece of paper covered in a plastic bag to prevent it from getting 9. She stood there, looking at me 10. Putting away my book, I took the paper, which 11 she and her family had to 12 their country because of floods, and she was 13 to support them. She had got a bit of money, but she needed 5 14 Euros to get home. I 15 in my pockets and found 20 cents. My friend 16 a 5 Euro note. I asked her to give it to the lady, and said that I would 17 the next day. When she got the money, the lady hugged us and said thanks again and again, and went on her way. Later on the bus, I wondered where her home was and 18 she had gotten to this country. In her story, I felt that my friend and I would always remain part of it as the 19, who helped her get home on a rainy day. But for me, helping a stranger did bring me happiness, giving me a pleasant 20.