巷道支护可以分为临时支护和永久支护两大类。

青蒿鳖甲汤不包含下列哪组药物（）

A.青蒿、知母

B.青蒿、丹皮

C.鳖甲、生地

D.知母、生地

E.鳖甲、柴胡

将同一种西瓜分别放在下列四种条件下培养（其它条件相同），则甜度最大的是（　　）

A．甲

B．乙

C．丙

D．丁

请用化学知识简答下列问题：

（1）铝制品能保存很长时间是因为铝的化学性质很活泼，在空气中表面能生成一层致密的氧化膜，该氧化膜的成分是 _________ （用化学式表示）

（2）打开汽水的瓶盖，汽水会自动喷出来，产生这种现象的原因是 _________ ．

（3）在CuCl₂和MgCl₂的混合溶液中，加入过量的铁粉，充分反应后过滤，所得固体为 _________ ．

（4）少量的金属镁放入到足量的稀硫酸溶液中充分反应后，剩余溶液中的溶质是 _________ （用化学式表示）

When Omega was born in Uganda, she did two things: Smile and then sing. When Omega was 4 years old, her talent(天赋) for music was recognized, so she became one of the youngest members of the first African Children’s Choir(合唱团). She traveled the world with the choir, and it was from this experience that she grew into a singer today.

Although having a beautiful voice, she had to find other ways besides music to earn a living at first. When she was 16, her parents sent her to the USA to study. Like her mother, Omega wanted to become a doctor and do something meaningful in her country of Uganda.  

However, like many artists, music was so much a part of her that she had to choose. With encouragement from her family and friends, she opened her own production company(制作公司) after graduation. Since then, she has been working as an artist. Her songs make people feel good about life. Apart from that, she is also interested in health care and education. Omega is one of those Ugandan females who are showing the world their valuable talents.

小题1:Her experiences in the Choir helped Omega to ____.

A．burst into song

B．recognize her music talent

C．travel the world

D．become a singer小题2: What is the meaning of the underlined sentence in paragraph three?

A．music was very important to her

B．music took her a lot of time

C．music cost her so much money

D．music was the last thing she would choose小题3: We can learn from the passage that Omega is ____.

A．a good teacher

B．a famous African artist

C．a kind politician

D．a warm-hearted doctor

汉代戒书与敕书的使用有什么区别？