下列各组离子在特定条件下一定能够大量共存的是 A．含有较多Fe3+的溶液：Na+
题型：选择题
问题：
下列各组离子在特定条件下一定能够大量共存的是
A．含有较多Fe3+的溶液：Na+、SO42-、HS-、NH4+
B．c(OH-)=1mol/L的溶液：AlO2-、CH3COO-、K+、Ba2+
C．pH=1的溶液：K+、Fe2+、NO3-、Na+
D．遇Al能放出H2的溶液：HCO3-、K+、Mg2+、Cl-
题型：选择题
看图阅读下面短文，并借助图片和上下文补充所缺信息，每个空格只能填写一个形式正确、
意义相符的单词。
One day, the weather was very hot. The 1_____ was shining brightly in the sky. A crow flew
over, he was very 2_____. He saw a bottle on the 3_____. There was only a little 4_____ in it. But
the neck of the bottle was too 5_____. He couldn't touch the water with his beak [(鹰等的)嘴].
How could he 6_____ the water? Suddenly, he saw some stones 7_____ the bottle. He came up
with a(n) 8_____. He picked 9_____ the stones one by one and put them into the bottle. More and
more stones in and the water rose up. Finally the crow drank the water. How 10_____ he was!