试题题干
Directions: Read each of the following sentences carefully, and choose A,B,C or D that has the closest meaning to the underlined word or phrase.
A technician will examine your blood under a microscope-counting the white cells in a small marked-off area.（）
参考答案
正确答案：
试题解析
separated by a line-drawing 用线条图分隔；marked-off 标记。
技术人员会在显微镜下检查你的血液，在一个小的标记区域内计算白细胞。