他们担心Gina不会说话，而现在Music had helped their daughter find her first words，故可推测on cloud nine是"非常高兴"的意思。

答案：　C

6．Gina sang for the first time before many strangers when she was________.

A．two B．five

C．six D．nine

解析：　细节理解题。根据第三段的Gina，who was six和sing in front of a lot of people she didn't know可知，Gina六岁时第一次在很多陌生人面前唱歌。

答案：　C

7．It can be inferred that when Gina sang at the first game she felt________.

A．nervous B．calm

C．shy D．satisfied

解析：　推理判断题。根据第三段末句After the tryout，she wasn't nervous anymore可知，这次表演之后，Gina再也不紧张了。由此推断，她第一次为比赛演唱的时候，也不紧张。

答案：　B

8．Why does Gina dream of becoming a singing teacher?

A．She wants to train more singers.

B．She thinks the job is very interesting.

C．She likes to spend time with children.

D．She wants to help children with autism.

解析：　细节理解题。根据最后一段的those kids who are different，like her可以推断，Gina将来想当一名音乐教师是为了帮助那些像她一样患孤独症的孩子们。

答案：　D