古人云“己所不欲，勿施于人”，指的是礼仪的（）。
A.尊重原则
B.从俗原则
C.真诚原则
D.宽容原则
E.适度原则
参考答案：A
用所给单词的适当形式填空。
1. I like watching TV and ______ (play) tennis.
2. My sister often plays tennis with ______ (she).
3. Her favorite ______ (subject) in school are music and P.E.
4. Kate's parents ______ (not) like playing computer games.
5. Could you tell me something about ______ (you), Jack?
下列物质既能与盐酸反应放出气体，又能与氢氧化钠溶液反应放出气体的是
A．Al
B．Al2O3
C．Al（OH）3
D．NaHCO3
