關於試題:9. Those college students work at the orphanage on a _____ basis, helping the children with their studies without receiving any pay. (A) voluntary (B) competitive (C) sorrowful (D) realistic (A) voluntary [ˋvɑlən͵tɛrɪ]自願的, 志願的 (B) competitive [kəmˋpɛtətɪv]競爭的; 經由競爭的, 競爭性的 (C) sorrowful [ˋsɑrəfəl]悲傷的, 傷心的 (D) realistic [rɪəˋlɪstɪk]現實的, 注重實際的, 實際可行的