某溶液中存在大量的OHˉ、Clˉ、CO32ˉ，该溶液中还可能大量存在_爱下问搜题

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问题选择题

某溶液中存在大量的OHˉ、Clˉ、CO₃²ˉ，该溶液中还可能大量存在的是

A．NH₄⁺

B．Ba²⁺

C．Fe³⁺

D．SO₄²ˉ

答案

答案：D

题目分析： A、因溶液中存在较多的OH^-，OH^-与NH₄⁺能结合生成弱电解质一水合氨，则不会大量存在NH₄⁺，故A错误；B、因溶液中存在较多的CO₃^2-，CO₃^2-与Ba²⁺能结合生成碳酸钙沉淀，则不会大量存在Ba²⁺⁺，故B错误；C、因溶液中存在较多的OH^-，OH^-与Fe³⁺能结合生成沉淀，则不会大量存在Fe³⁺，故C错误；故选D。

完形填空

One day Daddy and I went out      a walk. On the way we      a lot of people. We went up and     a look. Oh, dear!     did we see? There     a donkey(驴) in the middle of the road. It would not move. The cars and buses could not get      .
Then a policeman came."     donkey is this?" he asked. "It' s          ," said a farmer, "but I      move it." The policeman and the farmer did     best to move the donkey, but it would not move. We laughed, but the      of the cars and the buses were        . "We can't move the donkey," the farmer and the policeman said. "What shall we do?"
"Give him a carrot," my father said. "      a good idea!" said the farmer.
Soon he found a        and showed it to the donkey. When the donkey saw a carrot, it jumped up and walked after the farmer.      the cars and buses could get past at last.

选择题

读“甲、乙两地区城市化发展模式图”，完成第1～2题。

1．两地区城市化发展模式的共同点是[ ]

A．有较大规模的人口迁移

B．依靠外来资金支持城市化

C．有当地政府的大量投资

D．通过工业化带动城市化

2．以下对两地区城市化发展模式的叙述，正确的是[ ]

A．甲地区属外资驱动型的城市化

B．乙地区属于开发区驱动型的城市化

C．甲地区的典型发展模式在苏南地区

D．乙地区的典型发展模式在珠江三角洲