下列现象,属于共生的是( )
A:水稻和稗草
B:人体足癣
C:胰岛素基因转入大肠杆菌
D:豆科植物与根瘤菌
— When will you go to the park with me?
— _______ I have finished my homework.
语音:找出划线部分发音不同的一个选项。
①____ A. famous B. ask C. lake D. cake
②____ A. low B. cow C. how D. now
③____ A. with B. than C. weather D. that
④____ A. about B. famous C. loud D. south