A young woman rode with her new husband in a wagon(四轮马车)．They came to a log cabin (小木屋)．The man shouted and a little boy came running out of the cabin．Sarah, the young woman, got down from the wagon, opened wide her arms and held the boy close．
"Hello, Abe Lincoln," she said．"I think we'll be good friends．"
The new mother with the smiling face went to work at once．She washed Abe and his sister and tidied(弄整齐) their hair．And that night she threw away the boy's mattress(床垫) of leaves and gave him a soft mattress and enough blankets to keep him warm at night．
Sarah wove cloth and made new shirts for Abe．She made him new deerskin trousers and even deerskin shoes．
Maybe, if she hadn' t come to the cabin, he wouldn' t have lived to be a man．When Abe' s father told him not to go to school any more and help on the farm, Sarah took Abe' s part against his father．Abe would rather read than eat, and when his father told him to stop, Sarah said, " Let the boy read．"
In 1530 the day came when Abe would leave home to work in New Salem．For the last time she had taken Abe's part against his father．For the last time she had kept the cabin quiet so that Abe could read．
More than twenty years later,when Abe,whohad then become famous,was going to make a speech in a nearby town, Sarah went there just to watch him．In the crowd she tried to make herself small, but he saw her, and in front of everybody, got out of his carriage and went over and put his arms around her and kissed her．Yes, that was her Abe．
"He loved me truly," she said later．
If Sarah hadn' t come to the cabin,_______
事实细节题。从第五段可知，Abe的父亲反对他读书，但是Sarah来到之后，坚持让Abe读书。
把10gMgCl2和MgSO4的混合物溶于适量水中，滴加2mol／L的BaCl2溶液至沉淀完全，共消耗BaCl2溶液25mL。求混合物中MgCl2和MgSO4的质量各是多少克
固定在匀强磁场中的正方形导线框abcd，各边长为1．其中ab是一段电阻为R的均匀电阻丝，其余3边均为电阻可忽略的铜线。磁场的磁感应强度为B，方向垂直纸面向里。现有一与ab段的材料、粗细、长度都相同的电阻丝PQ架在导体框上，如图所示。PQ以恒定速度方向如何
一小物块以速度v0=10m／s沿光滑地面滑行，然后沿光滑曲面上升到顶部水平的高台上，并由高台上飞出，如图所示。问当高台的高度h多大时，小物块飞行的水平距离最大这个距离是多少(g=10m／s2)
某晶体盐的水溶液呈浅绿色，在此溶液中通入氯气，溶液变为棕黄色，把所得棕黄色溶液分成两份：一份加入KSCN溶液，溶液变深红色；另一份加入BaCl2溶液，产生不溶于稀HNO3的白色沉淀，则该晶体盐的化学式是_______。
欲除去乙烷中的乙烯，可将混合气体通过盛有_______的洗气瓶；欲除去乙炔中的硫化氢，可将混合气体通过盛有_______的洗气瓶。
浓硝酸常盛装在棕色瓶中，且贮放在冷暗处，原因是_______，
碳酸氢钠溶液和烧碱溶液反应的离子方程式为_______。
常温下，氨水中存在的离子有_______。
在酸或碱存在的条件下，甲酸甲酯跟水发生水解反应的化学方程式为_______。
有下列几种气体：H2、O2、HCl、NO、NH3、CH4，其中通常情况下能用来和水做“喷泉”实验的是_______。
