题目

阅读短文，回答问题My name is Lily.I'm twelve years old. I like September very much. September 9th is my birthday,and my father's birthday is in September, too. We have a birthday party everyyear. In our school, we have a singing contest on September 18th. And we have asports meet on September 27th, too. I am really busy this month, but I am veryhappy. Which month do you like best? （1） It's Lily's ________ birthday this year. A . twelve B . twelfth C . twentieth （2） ________ is not in September. A . Lily's birthday B . The sports meet C . Lily's mother's b化简：a3•a3+（-2a3）2+（-a2）3．