吸烟有害健康，原因是烟草中含有对人体有害的物质(主要是尼古丁)，这种有害物质主要存在于烟草细胞的[ ]
A．细胞壁
B．细胞质
C．液泡
D．细胞核
答案：C
Once the new rules are made, what matters much next is how they will be ________ to all the members
of the club. [ ]
A. devoted
B. referred
C. applied
D. directed
