皮皮学，免费搜题
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【单选题】
在 铁离子 、氯铝子 、钙离子 、镁离子的混合溶液中 ,用 EDTA 测定钙离子 和镁离子 , 消除 铁离子 、铝离子的干扰 , 最简便的是 ( ) 。A.
沉淀分离法
B.
控制酸度法
C.
配位掩蔽法
D.
离子交换法
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文：W: Alex, are you going to have a conference call this evening? M: No, Susan. I have another commitment. Q: What does the man mean? (13)
A.
He'll try hard to attend the conference.
B.
He has to go somewhere else.
C.
He doesn't like commitments.
D.
He has forgotten the conference call.
【单选题】What else does Susan like to do?
A.
listen to music
B.
watch films
C.
read and write microblogs
【简答题】Listen for the following 3 sentences and write them out.
【单选题】What else does Susan like to do?
A.
listen to music
B.
watch films
C.
read and write microblogs
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