B．To do some repair work.

　　C．To admire the rising sun.

　　D．To check safety equipment.

　　解析：选B　细节理解题。由第三段中的"We had to go out of the balloon's capsule (舱) ... three times while in the air to repair the fuel"可知，作者的团队在飞行过程中从飞行舱出来是为了做一些修理工作。

　　B

　　The African Children's Choir (合唱团) is made up of children who are 7 to 10 years old from Africa. They have incredible (惊人的) voices and spirit that amaze the audience everywhere they go!

　　And they go to a lot of places, all around the world. And not only do they travel a lot, but they perform with some superstar singers and celebrities (名人) for heads of state. But this is not what makes the choir so special.

　　Like New York's PS22, they do not just sing, but truly put their hearts, souls and bodies into their words. But what is unique about the choir is that it offers hope, education and confidence to children who live in extreme poverty. For example, the kids in the choir are mostly from the poorest countries in the world, such as Uganda. Many children live in one­room homes and walk more than 2 miles to get water for their family. Most of the children have lost one or both of their parents because of wars or diseases.

　　Through its music and education, the African Children's Choir changes the lives of its children. It allows them to see the world. It gives them hope and confidence. It shows them that everything is possible. The choir even pays for their education through college. In 30 years, it has educated and changed the lives of over 50,000 children.

　　And, in turn, the children return to their hometowns with new thoughts and new skills to help improve their family and community. These children are truly helping to build a better Africa.

　　语篇解读：本文是一篇说明文。文章主要讲述了非洲儿童合唱团，由非洲一些贫困儿童组成，他们给听众带来希望和信心，他们自己的命运也得到了改变。

　　4．What can we learn about the members of the African Children's Choir?

　　A．They have no parents.

　　B．They are all ten years old.

　　C．Many of them live a hard life.

　　D．Some of them come from PS22.

解析：选C　推理判断题。根据第三段中的"... the kids in the choir are mostly from the