专题05 阅读理解之说明文-学易金卷：2023年中考英语二模试题分项汇编（全国通用）

专题05 阅读理解之说明文 （2023·江苏泰州·校考二模） When you eat something, your stomach breaks down its large molecules(分子) into smaller ones. Many people like to eat pineapples(菠萝). So when you eat pineapples, they can “eat” you by breaking down the molecules in your body. Pineapples have certain enzymes (酶) that can break down proteins (蛋白质). Many smaller molecules like the pearls(珍珠) come together to form the long pearl necklace of a protein. You can cut a necklace with scissors. In the same way, the enzymes in pineapples “cut up” proteins. All living things have proteins. They are an important part of the cells (细胞) in your body. If an enzyme can break down a protein, it can break down cells as well. So will the cells of your tongue (舌头) when you eat pineapple. This is why your mouth will hurt if you eat too much pineapple. But luckily, the cells in your tongue cure itself fast. And after you have swallowed the pineapple, the special enzymes will be broken down by your stomach. It won’t “eat” you any more. Why does pineapple have these enzymes? Some scientists believe that they are created by the pineapple to prevent animals from eating its fruits before they are ripe (成熟的). Once the fruit is ripe, its enzymes won’t hurt an animal’s tongue and the fruit will be okay to eat. Another reason is that the enzymes help the seed (种子) to grow up. They play an important role in sending messages to the cells of the plant. These messages tell the cells when to start and stop growing. Without these enzymes, the seed may not be able to properly develop. 1．In Paragraph 1, the enzymes in pineapples are compared to (被比作) ________. A．scissors B．necklaces C．proteins D．pearls 2．The underlined word “swallowed” in Paragraph 3 can be put in Sentence ________. A．The meat went bad so he it out after he tasted it. B．This kind of pill should be whole, with some warm water. C．The blackboard should be by the students on duty before class. D．The stars from behind the clouds, shining directly into my