快过年了，婷婷帮妈妈打扫房间卫生，她让妈妈多休息一会儿；郑浩经常帮妈妈做饭，还夸夸妈妈的烧菜手艺；李钢的爸爸是个清洁工人，他帮爸爸打扫卫生，让爸爸早点回家；年夜饭家里做了大虾，吃饭时董雷先夹给爷爷奶奶和爸爸妈妈吃。上述事例说明[ ]

A．孝敬父母要从小事做起

B．孝敬父母就要做惊天动地的大事

C．只要学习好，就是孝敬父母

D．明白孝敬父母的道理，就是孝敬父母

---I don’t know how to write the article assigned by our professor on international trade.

--You should have ______ your attention on the lecture that ______ how international situation affects exports and imports across the globe.

A．put; concentrate on

B．paid; talked about

C．fixed; dealt on

D．focused; focused on