"Seasame Street" has been called "．the longest street in the world"．
This is because the television program by that name can now be seen in so many parts of the world．
The program ,which went on the air in New York in 1969, uses songs ,jokes, and pictures to give children a basic understanding of numbers,letters and human relationships．More than 6 million children in the United States watch it regularly．The viewers (观众) include more than half the nation' s children before school age．
Many teachers consider the program a great help, though some teachers find that problems happen when the first-year pupils who have learned from "Seasame Street" are in the same class with those who have not watched the program．Tests have shown that children who watch it five times a week learn more than those who seldom watch it．In the United States the program is shown at different hours during the
week in order to increase the number of children who can watch it regularly．
Why has "Seasame Street" been so much more successful than other children's shows? Many reasons have been suggested．Perhaps one reason is that mothers watch "Seasame Street" along with their children．But the best reason for the success of the program may be that it makes every child watching it feel able to learn．The child finds himself learning, and he wants to learn more．
"Seasame Street" is a TV program produced mainly for
事实细节题。从第三段可知，“芝麻街”就是少儿电视节目。
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_______。
