When ________ different cultures, we often pay attention only to the differences without noticing the many similarities.（     ）

读我国的人口分布图回答：

根据短文内容及所给首字母，将正确的单词写在答题卷上
   James works in a food shop. He helps the shopkeeper. He puts f____  on the shelves every day. Then people come into the shop and buy the food. Today there aren’t any bags of flour(面粉) on the shelf.“James,” says the shopkeeper. “We n____  some flour. Bring some bags of flour to the shelf. Hurry up!”
   James runs to get some bags of flour. They are in another room and they are on the top shelf. The shelf is high up. James is tall b____ he can’t reach the bags.
   James bring two boxes and puts one b____  on the other. Then he stands on them. Now he c____  reach(够到) the bags on the shelf.

1830年，英国正式启用第一条商业铁路，十年后公布火车时刻表。因为火车比马车快太多，所以各地时间的微小差异就造成了巨大的困扰。1880年，英国首次立法规定全国的时刻表都必须以格林尼治时间为准，这就要求人们依据人工的时钟而非依据当地日升日落周期来过生活。这段材料重在说明（  ）