荆轲和而歌，____，____。

将下列国家与其对应的特征配对组合

A．日本____                           1．世界上最大的农产品出口国

B．俄罗斯____                         2．“坐在矿车上的国家”

C．澳大利亚____                       3．多火山、地震的岛国

D．美国____                           4．“咖啡王国”

E．巴西____                           5．世界上面积最大的国家

某白色粉末可能含有MgCl₂、Na₂SO₄、Ba(NO₃)₂、K₂CO₃中的一种或几种。把该粉末放入足量水中充分搅拌，有白色不溶物产生。过滤，向不溶物中加入稀硝酸，不溶物部分溶解。该白色粉末不能确定是否存在的是（）

Different countries have different food, such as French fries, Italian pizza and so on. In China, fast food is becoming more and more popular these days. For example, McDonald's and KFC. Why do Chinese people like fast food so much? There are many reasons. First, it is quick. It takes little time. Second, it is easy to carry. Third, people like the restaurant's relaxing environment and American style. Though it tastes good, fast food generally contains little nutrition (营养). If you want to have a healthy body, do not go to fast food restaurants too often. Eat more fruit and vegetables.