2023届高考英语三轮复习阅读理解七选五冲刺训练：说明文篇 (5)

2023届高考英语三轮复习阅读理解七选五冲刺训练：说明文篇（5） ①为什么蚊子叮咬会痒 【题目】 If you’ve ever been bitten by a mosquito, you know how frustrating their bites can be. ____1____ , creating an itch (痒) that once you start scratching only seems to get worse. Why does a mosquito bite itch and what can we do? Why does a mosquito bite itch? When a mosquito bites you, it pierces the skin using a special mouthpart to suck up blood and injects saliva (唾液) into your skin. Mosquitoes’ saliva has lots of proteins in it, some of which our body recognizes as foreign, and our immune cells spring into action to try to fight them. ____2____ . It’s actually the body’s response to the foreign mosquito protein it is trying to fight. That’s why some people may only have a mild reaction to bites, while others, more sensitive to the foreign protein, react with large areas of swelling that are more painful. What helps resist the urge to scratch? “Don’t scratch” is the advice that most experts and health professionals give. As hard and sometimes unrealistic as it can sound, scratching inflames (发炎) the skin, and the inflammation makes the skin itch more. “ ____3____ ,” warned Daniel Markowski, technical adviser for the American Mosquito Control Association, adding that in extreme cases, people can scar themselves. Instead, there are dozens of creams and sprays that promise itch relief as well as home remedy (疗法). Choose what’s right for you can often come down to trial and error. In general, all of the various anti-itch creams are very similar. There is no scientific evidence these remedies work, and they can come with their own precautions or side effects. ____4____ . ____5____ Some people can have serious allergic reactions to mosquitoes, although in practice it is rare, Vosshall said. If you experience severe symptoms such as breathing trouble, you should seek medical attention immediately. A．When to seek medical attention? B．What to do with a mosquito bite? C．It’s not the bite that causes the itch D．The more you sc