在酸性溶液中，下列各组离子可能共存的是（  ）

如图所示，一理想变压器的原线圈匝数为n₁=1000匝，副线圈匝数为n₂=200匝，电阻R=8.8Ω，原线圈接入一电压（V）的交流电源，电压表和电流表对电路的影响可忽略不计，则

根据对话内容，从下面方框中选择适当的单词或词组填空，使对话内容完整正确。
medicine,      started,      terrible,      often,      wrong   
B: Bob                  D: Doctor
D: Come and sit down, Bob. What’s ____ with you?
B: I have a ____  pain in my stomach, doctor.
D: I see. When did it start?
B: It ____  yesterday. I didn’t want to eat anything. I’m not feeling well now.
D: Let me see, er, you have a fever.
B: I’ve got a headache, too. And my throat hurts.
D: Well, you’ve caught a bad cold.
B: I know these days the H7N9 flue is very popular. Is it serious?
D: No, not very serious, your temperature isn’t very high. Pay attention to your food and remember to wash your hands before meals. And you must stay in bed for 2 or 3 days and take the Chinese ____ .
B: How____ should I take it?
D: Three times a day after meals.
B: Thank you.

—Glad to meet you．
—____________

给课文《刺猬汉斯》分段。