阅读材料，完成下列问题。

材料一：安第斯山脉属于科迪勒拉山系，也称安弟斯山脉或安蒂斯山脉，位于南美洲的西岸，范围从巴拿马一直到智利。从北到南全长8900余千米，是世界上最长的山脉，纵贯南美大陆西部，素有“南美洲脊梁”之称，山脉有许多海拔6000米以上、山顶终年积雪的高峰。

材料二：玛咖是一种保健及药用价值极高的农产品，因产量极低而价格昂贵。玛咖原产于海拔3500～4500米的秘鲁安第斯山区，玛咖的生长条件非常苛刻，它只适宜生长在高原山区高寒地带，玛卡为喜强光照植物，对环境污染相当敏感。

______ Gina             Tara are studying Chinese history and culture now. They find them rich and amazing.

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：把多余的的词用斜线（＼）划掉。

修改：在错的词下面划一横线，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。

    Today we had a chemistry test. I found the test difficulty, but I tried hardly to do it. Suddenly, my best friend Mary asking me to let her to copy my answers. After think for some time, I let her copy my answers. But after the test, all of us were called to the teacher’s office. The teacher was angry because we had same answers in the tests. We were warned not to cheat again so she would need to see our parents. I was very upset. I was just helping a friend. Why does she punish me?