____ ____ she ____ ____ ?

测定大理石含CaCO₃的质量分数，取大理石样品12.5g，加入盛有100g稀盐酸的烧杯中，两者恰好完全反应（假设其他杂质不与盐酸反应，也不溶解）．烧杯内物质的质量变为108.1g．试计算大理石样品中CaCO₃的质量分数．

核电站可用硼酸（H₃BO₃）吸收中子，阻断核辐射。硼酸中硼元素的化合价是（ ）

用方框中所给的句子填空。请将正确答案的序号填在题后横线上。

Receptionist: ____  Madam?
Alice: I want a single room. I booked（预定）it three days ago.
Receptionist: ____ .
Alice: It’s Alice. Alice White.
Receptionist: Oh, yes. Here it is. You want a single room.
Alice:____  And if it is possible, I’d like a room on the ground floor.
Receptionist: ____  all the rooms on the ground floor have already been taken. But we do have a nice room that overlooks the hotel swimming pool. It is on the second floor.
Alice: Thank you. ____  is the restaurant still open?
Receptionist: I’m afraid not. But you can order room service.
Alice: OK. Thank you