题目

You feel tired and you have no energy. You can’t breathe out of your nose and your throat hurts. Don’t be afraid you have probably just got a _____ . Every year, many kids experience this sick feeling. Some kids have up to eight colds every year. So, what_______ is a cold?Well, a cold is an infection （传染病）. It affects （影响） your nose, ears and throat and makes you feel sick and weak. It’s very _____ to catch a cold. When someone sneezes or coughs near you, bacteria （细菌） travel through the air and ______ your body and then make you sick. Also, if you touch your no8．建立细胞学说的科学家是施旺和（　　）A．达尔文B．克里克C．沃森D．施莱登