PPC搜索引擎广告活动中有两个关键之处：（）与（）。
参考答案：以合理的价格购买合适的关键字；然后优化调整相关设置以获取最大收益
Innovative approaches to manufacturing, coupled with the tremendous size of the domestic market, led to the emergence of the United States as an industrial giant.
A．followed by
B．deriving from
C．combined with
D．mixed with
细菌性痢疾时肠黏膜坏死可表现为（）
A.弥漫性大片坏死、溃疡形成
B.与肠轴平行的圆形或椭圆形溃疡
C.裂隙状溃疡
D.大小不等、形状不一的表浅溃疡
E.反复发作的溃疡
