One sunny afternoon, a seven-year-old girl went for a walk. She crossed a large area of grassland into the woods 1 she realized that she was lost.

    Sitting on a rock and2what to do, she began crying.  After a while. She3 to walk along a wide path lined with tall trees and thick bushes.4 it was getting dark, she saw a small, dark wooden house. She opened the door and 5 stepped in. Suddenly, she heard a strange noise, and she ran out the door and back to the 6. Cold and tired, she fell asleep near a 7.

    The girl's parents were out and her dog, Laddy, was at home. Laddy8 that his mistrees（女主人）was in danger. He jumped 9 a window, breaking the glass. He looked in the fields. But he couldn't find his mistress anywhere. However, from the ground came a 10 scent (气味) as he lowered his head. He 11the scent and walked across the grassland. Barking 12 into the air, the dog 13 through the woods until he found the 14. But the girl was not there, so he headed back to the woods. Much to his 15 , he saw his mistress' blue shirt in the distance. He 16 over some bushes and saw the little stream, where the girl was 17.

    When she opened her eyes and18 her dog standing beside her, the girl said, “you 19me, Laddy,” and she kissed him several times. Seeing their daughter and dog coming back, the parents burst into tears of20 . That night Laddy had a heror's supper: a huge meal of steak

下列是分析久置空气中的NaOH固体的相关实验（不考虑水分），其中合理的是（　　）

    棉花生长适宜温度为25~30℃，对光照要求较高。15世纪英国开始出现棉花种植，但并未得到迅速发展。18世纪中叶产业革命首先在英国的纺织业中开始，1769年阿克莱特发明了水力纺纱机，1776年瓦特改良出第一台有实用价值的蒸汽机，使英国棉纺业快速发展，技术领先，成为世界棉纺中心，到19世纪中期棉布产量占世界近50%，生产模式多为：进口原料（棉花）一加工一出口产品（棉布等）。19世纪末英国纺织业地位开始下降，二战后开始衰退，同时人地矛盾加剧，政府提高了环保要求。下图示意英国地理位置及伯明翰多年平均各月气温、降水量统计资料。

如图所示，一倾角为45°的斜面固定于竖直墙上，为使一光滑匀质铁球静止，需加一水平力F，若力F过球心，下列说法中正确的是（   ）