题目

完形填空；根据短文内容选择最佳答案。How do you feel when you have to make a report in front of your classmates? What about when you go to a bitthday party? Do you get    1   shy?Shyness means feeling nerous or     2    when you’re round other people. Everyone experiences（体验）this shyness     3    they grow up. Most people have red faces and talk in broken sentences when they are in the center of attention. It’s OK if it takes you a while to feel yourself again when you go to a new place or meet strangers.    4   , everybody gets a little shy下列关于组成细胞的元素与化合物的说法，不正确的是（ ）A. 组成细胞的常见的元素有20多种，其中碳元素是最基本元素B. 水是活细胞中含量最多的化合物，是某些生物化学反应的原料C. 高等植物细胞的组成成分都含有纤维素和果胶D. 细胞中的无机盐主要以化合物的形式存在