生物体结构和功能的基本单位是_______;最大的生态系统是________;环境中影响生物形态、生理、分布的因素称为__________。
细胞 生物圈 生态因素
Many people agree that there has never been a more splendid opening ceremony than _______ of the Guangzhou Asian Games in history.
A.one
B.that
C.which
D.this
可化痰止咳的药物有()
A.柴胡滴丸
B.橘红片
C.保济丸
D.葛根芩连片