1928年底，一位热血青年在井冈山入伍参军，当时他参加的军队应是(    )

下图为肾单位结构模式图，分别从其不同的部位抽取三种液体样品甲、乙、丙进行化验，结果如下表。请分析回答问题：

增加：在缺词处加一个漏字符号（∧），并在下面加上该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写上修改后的词。

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。

    When I first came to England, I know little English. As you can probably guess it, my life was difficulty for a time. Simple tasks like ordering food or take a taxi were quite stressful. I signed up for classes and studied on my own as well, so I made poor progress. I became very discouraging. Finally, I found best way to learn English was to make friends with native speakers and spend time with them. I appreciated playing in a band with an English woman which became one of my best friend in London. My English improved great by hanging out with her.