Salt also played an important part in population movement and world exploration. Explorers understood that if they could keep food fresh, they could travel longer distances. So they used salt to preserve food and explored the world.

　　Salt was so important that, according to food historians. It was traded pound­for­pound for gold. Today, people still use the expressions “to be worth one's salt” or “worth one's weight in salt”. The expressions describe a person of value.

　　A person might also be called salt of the earth. That description means he or she is dependable and trustworthy. However, when you say “I think we should take what he said with a grain of salt” you mean you accept it but maintain a degree of doubt about its truth.

　　语篇解读：英语学习者都认识salt这个单词，它的基本意思是“盐”，但是，它的含义远不限于此。

　　28．What can we learn from the first paragraph?

　　A．Salt plays an important part in our life.

　　B．Salt makes food tasty.

　　C．Salt is considered to be part of our muscles.

　　D．Salt is sure to damage nervous systems.

　　答案：A　推理判断题。依据第一段可知，食盐对我们的肌肉、心脏、神经系统起着决定性作用，因此食盐是我们生命中的主要部分。

　　29．A beggar's bread was stolen last night, which means ________.

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