题目

地球上的生命千姿百态，从生物圈到细胞，生命系统层层相依又各有特定的组成、结构和功能。下列属于生命系统结构层次中细胞层次的是（   ） A.一个病毒    B.一个受精卵     C.一个洋葱     D.一个蜂巢 答案：B短文改错假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号(/\)，并在其下面写出该加的词；删除：把多余的词用斜线(\)划掉；修改：在错词下画一横线，并在该词下面写出修改后的词。注意：1. 每处错误及其修改均仅限一词；2. 只允许修改10处，多者(从第11处起)不计分。Mary wanted to be a nurse when he left school. Meanwhile, she joined the Red Cross and had some limited training. She taught that in case of an accident she should give the person first aid at once or then send for a doctor. One day, there were an accident in a busy street. When Mary arrived in, she saw a man bending over a woman who had been knocked down by a car and lied motionless in the street. Mary ran up, pushed the man away, informed the crowd what she was a Red Cross nurse and began to help a wounded woman. After a few minutes, the man said, "While you reach the part about send for a doctor, don’t worry. I’m here already.