biology               A. commercial      B. observe    C. occur            D. obvious

找出与所给单词划线部分读音相同的选项。

1. chapter                     A. chorus                  B. stomach     C. chain             D. Christmas

2. worthy                  A. thread               B. further        C. worth             D. through

3. chief                 A. believe              B. lie              C. tie                 D. diet

4. biology            A. commercial       B. observe    C. occur           D. obvious

5. explanation        A. excellent            B. excuse              C. explain          D. express