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。

    Thanksgiving Day is one of the most important family holiday in America. All the members of a family, no matter where far away they are, will try to get together on that day. The first Thanksgiving in America takes place in October, 1621. In 1620, the group of Englishmen sailed to Massachusetts. They had expected to find a freely place to live in, so they experienced a hard winter. Half of them starved death. The next spring, we began farming. With the help of local Indians, they learned to be plant corn and raise animals. In the autumn, the fields produced a good harvest. Filling with joy and thanks to God, they held a celebration. In 1863, it became a national holiday.

    湄南河发源于泰国北部山地，自北而南地纵贯泰国全境，全长1 352千米，是泰国第一大河，首都曼谷就坐落在湄南河的入海口处。首都曼谷所在的泰国南部地区洪灾危害严重，如2011年因持续暴雨而引发的洪灾，至少造成700多人死亡，数百万人受洪水影响。

图a和图b分别为泰国地形图和曼谷气候直方图。

一个物体在两个平衡力作用下下落，它的（  ）

有一包固体粉末可能含有Na₂CO₃、FeCl₃、CaCl₂、NaOH中的一种或几种，为了探究它们的成分，进行如下实验：①取少量该固体粉末加入足量的水，充分搅拌后过滤，得到白色沉淀和无色滤液；②向滤液中滴加酚酞溶液，溶液变红．根据上述实验回答下列问题：