第一部分 阅读理解（共两节，满分40分）
第一节 （共15小题；每小题2分，满分30分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
A
In the Stone Age, people didn’t need to find salt. They were hunting a lot of their food, and eating a lot of red meat. Red meat has plenty of salt in it, and naturally, people at that time didn’t have to go and find extra salt. But when people began to farm, about 10,000 BC, they started to eat mainly grains like rice and very little meat. Then they really needed another way to get salt. People sprinkled(洒) salt on different kinds of food, because there were no refrigerators.
