“种瓜得瓜，种豆得豆”这种现象主要取决于下列哪一结构[ ]
A．细胞壁
B．细胞膜
C．细胞质
D．细胞核
答案：D
在导致腰痛的外感诸邪何者最为关键（）。
A.风邪
B.湿邪
C.寒邪
D.热邪
E.燥邪
If you still have any other questions, please ______ your hand. [ ]
A. put off
B. put down
C. put on
D. put up
