如图是光学显微镜的4个镜头，甲、乙的一端无螺纹，丙、丁的一端有螺纹．若要在视野内看到最多的细胞，宜选用的镜头组合是（    ）

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：在错的词下划一横线，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。

    The person that we should learn needn't be rich or famous. It can be a person we live with. For I, it's my father. I still remembered the days when I was a child. Although he had plenty of works to do, he still stayed with me but played games with me. With time gone by, I'm in Senior 3 now. It is I who has no time to stay with him now! However, he is still behind me and tries his best to make it a better life for our family. What selfless he is! I am very gratefully to him. He is not only my father, but also a hero living with me!

美国是遭受飓风和龙卷风侵袭严重的国家(飓风是一种发源于热带洋面的大气涡旋,在太平洋地区称台风) 龙卷风频发与该区域地形有直接关系,美国的地形地势特征是  (    )

阅读下面的诗歌，完成小题。

御街行    秋日怀旧

范仲淹

    纷纷坠叶飘香砌，夜寂静、寒声碎。真珠帘卷玉楼空，天淡银河垂地。 年年今夜，月华如练，长是人千里。

    愁肠已断无由醉。酒未到，先成泪。残灯明灭枕头欹，谙尽孤眠滋味。都来此事，眉尖心上，无计相回避。

【注释】①香砌（qì）：指花坛。②欹（qī）：倾斜。③都来：算来。