题目

根据短文内容, 从方框中选择恰当的单词填空。where,their,but,tidy,under Hello, I'm Anna. This is my room. It is not very big it's comfortable(舒适的)and it's very .This is my bed. My desk and my chair are next to (在 ……旁边)the bed. are my pens? They're in my pencil box. What's that the desk? It's a model plane. My parents are Alan and Mary, and room is next to mine. 答案：【1】but【2】tidy【3】Where【4】under【5】their3．设NA为阿伏加德罗常数的数值．下列叙述正确的是（　　）A．完全氧化56g Fe需要消耗氯气33.6 LB．7.8g Na2O2溶于100ml水，转移电子数为0.1NAC．向100mL 1mol/L的NaHSO3溶液中加入足量的硫酸铁，则反应后氢离子增加0.4molD．利用铝热反应将磁铁矿还原得到16.8g铁单质，反应中Fe得到了0.9NA电子