1. (2021·开江模拟) 先通读下面的短文，弄懂大意，然后从后面各题所给的A、B、C、D四个选项中选出可以填入相应空白处的最佳答案。

Zheng He was a famous Chinese explorer. In 1405, he 1 from China on the first of several great voyages(航行). His task was to develop relations and2 trade routes with foreign countries.3 trading, the voyages also encouraged the exchange of cultures and technologies, which helped the 4 of those countries and regions. Today, people still remember him 5 a pioneer in opening up cultural contacts between different peoples around the world.