africa的形容詞形式怎么寫

　　The African elephant is in a desperate plight.

　　非洲象正面臨絕境。

　　They flew the flag of the African National Congress.

　　他們揮動著非洲國民大會的旗幟。

　　Three-quarters of the students are African American.

　　3/4的學生是非洲裔美國人。