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【简答题】
某无色透明溶液可能含有下列离子：K + 、Al 3+ 、Fe 3+ 、Ba 2+ 、NO 3 - 、SO 4 2- 、HCO 3 - 、Cl - ，取该溶液进行如下实验： ① 用蓝色石蕊试纸检测该溶液，试纸显红色；___________________________。 ② 取溶液少许，加入铜片和稀硫酸共热，产生无色气体，该气体遇空气立即变为红棕色； ③ 取溶液少许，加入氨水有白色沉淀生成，继续加入过量氨水，沉淀不消失； ④ 取溶液少许，滴入氯化钡溶液产生白色沉淀； ⑤ 取实验 ④ 后的澄清溶液，滴入硝酸银溶液产生白色沉淀，再加入过量的稀硝酸，沉淀不消失。 请回答下列问题： （1）用简要语言描述在实验①中的操作__________________ （2）根据上述实验判断原溶液中肯定存在的离子是_____________，肯定不存在的离子是____________ （3）写出与②③两个实验有关的离子方程式： ②___________________________ ③_________________________
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【单选题】Everyone wants to live in a beautiful, comfortable and “livable” place, but not ______ know where it is.
A.
all
B.
some
C.
either
D.
both
【单选题】Conversation 1 Q: What does the man mean when he says that he gets cold feet?
A.
He's sick and tired of it.
B.
He steps into a wrong place.
C.
He can't stand the cold weather.
D.
He loses his courage or confidence.
【单选题】Everyone wants to be a friend of _______________ is considerate and shares the same interests.
A.
anyone
B.
whomever
C.
whoever
D.
no matter who
【简答题】In addition, we ____________(不应忽视)that everyone wants a friendly and peaceful society.
【单选题】Everyone ____ to know how ________ to the shopping mall ?
A.
wants, get
B.
wants, to get
C.
want, getting
D.
wants ,to getting
【单选题】Everyone wants the best for a baby. A mother wants her baby to have the best in the ways of food, toys, clothing and equipment. Her value judgments on prices may go wrong when it comes to buying for a...
A.
Christmas advertising
B.
sweets
C.
television
D.
special powders
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