[多项选择]中国南方人(即居住在长江以南的人)以大米为主食，中国北方人则更喜欢吃面条和饺子。饺子有许多样式，从东北到北方各省的饺子形状各有不同。但不管饺子形态怎样，伴随着饺子的传统是不变的。以春节大餐为例，在春节除夕夜，大多数家庭都会守岁到下半夜，家里灯火通明。这个习俗对于几代同堂的大家庭来说尤为重要，因为大家相信，守岁会保证家里的老人晚年长寿、健康、幸福。而一家人一起包饺子是打发漫长守岁时光的一个办法。

参考答案:

Translation for reference
While rice is a staple food for southerners, (defined as those living south of the Changjiang River), the northern Chinese prefer noodles and dumplings. Jiaozi, or dumplings, take on many forms, their shapes shifting as they pass through the provinces in the northeast or north. But whatever their forms, the traditions that go with them do not change. Take feasting during the Spring Festival for example. On the eve of the Lunar New Year, most families keep vigil way past midnight, with every light in the house blazing. This custom is especially important for extended families since it is believed the vigil will ensure that the old folks have many healthy, happy years ahead of them. And making dumplings together is one way to keep oneself occupied during the long vigil.
答案解析:1．中国南方人(即居住在长江以南的人)以大米为主食，中国北方人则更喜欢吃面条和饺子。
这句话使用表达对比关系的连词while，连接两个分句。主食：staple food/principa