某无色透明的强酸性溶液中，能大量共存的一组离子是( )
A．Mg2+、Al3+、SO42-、Cl-
B．Na+、AlO2-、K+、SO42-
C．MnO4-、K+、SO42-、Na+
D．NH4+、NO3-、Fe2+、Cl-
答案：A
本题考查离子共存的知识，条件是无色酸性溶液，B中AlO2-不能共存，C中有颜色，D中Fe2+与NO3-不能共存。A正确。
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| A: Good morning, doctor. B: Good morning. (1)_________. A: I'm not feeling well. I have a headache. B: (2)__________. A: About two days ago. B: Come here! (3)___________. Oh, your temperature is OK. Did you sleep well last night? A: Oh, no. B: That's the problem. Don't worry. You've just got a cold. A: (4)________. B: I'm afraid you can't. You should stay at home for a day or two to have a good rest. Take this medicine three times a day. (5)________ A: Thank you, doctor. B: You are welcome.
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