问题
填空题
常温下，某同学从一种未知的无色溶液中检验出Ba2+、Ag+，同时测得溶液的酸性很强，他准备继续检验 溶液中是否含有大量的Cu2+、Cl-、CO32-、K+、Al3+、SO42-、NO3-等离子。显然，有些离子无需再做实 验，有些离子还必须通过实验来检验，你认为还必须检验的离子是____________。
答案
K+；Al3+
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常温下，某同学从一种未知的无色溶液中检验出Ba2+、Ag+，同时测得溶液的酸性很强，他准备继续检验 溶液中是否含有大量的Cu2+、Cl-、CO32-、K+、Al3+、SO42-、NO3-等离子。显然，有些离子无需再做实 验，有些离子还必须通过实验来检验，你认为还必须检验的离子是____________。
K+；Al3+
| 完形填空。 | ||||
| One of Jack's friends loves money very much, and he never gives anything to __1__. Soon he becomes very rich. One day, while he was walking near a river __2__ his friends, he slipped (滑倒) and fell into the river. His friends ran to help him, and one of __3__ kneeled (跪) on the ground, held out his hand and said, "Give me your __4__, and I will pull you out!" The rich man's head went under the __5__ and then came up again, but he didn't give his hand. Again another one tried, but again __6__ thing happened. Then Jack said," __7__ my hand and I will pull you out!" The rich man took his hand, and Jack pulled him out of the water. "You don't know our __8__ very well," he said to __9__, "when you say "Give' to him, he does nothing, but when you say 'Take', he does what you tell him __10__." | ||||
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