B．Stick to what is right.

　　C．Follow your friend's advice.

　　D．Be careful when making friends.

　　解析：选B　推理判断题。根据第四段中的"But if you do not owe him the money, do not pay him the money. It's a matter of principle."可推测，作者认为钱的数目不重要，重要的是原则问题。因此他觉得在对的事情上要坚持自己的立场，不要轻易作出让步或改变。

　　3．The underlined word "context" in the text probably means "________"．

　　A．choice　　　　　　　　 B．person

　　C．situation D．answer

　　解析：选C　词义猜测题。根据倒数第二、三段举例说明"It doesn't matter to me."在不同的语境意思不同可知，该表达取决于上下文语境，故选situation。

　　4．The author develops the text mainly by ________.

　　A．using examples

　　B．giving instructions

　　C．describing his experiences

　　D．discussing research findings

　　解析：选A　写作手法题。根据文中用不同的例子来讲解matter的用法可知，作者主要是通过举例来展开全文的。

　　B

　　Genetically modified (GM) foods (转基因食品) have been around for many years. They are developed for a number of different reasons - to fight disease, resist pests, improve nutrition, survive drought - and are mainly found in our food supply in processed foods using corn, soybeans and as feed for farm animals. Are they safe? How do they affect the environment? Can they improve food security? Is the world better off with or without GM foods?

　　Supporters of GM foods say that farmers who grow these crops are able to use fewer environmentally damaging farm chemicals. The increased output is important to feeding the world's growing population. And many studies have shown that GM foods are safe to eat and that there's no actual evidence of any health risks. They also add that the foods have been thoroughly examined and have gained approval for eating from a wide variety of government and scientific bodies.

Critics, however, are concerned that these foods have not been strictly tested and are potentially dangerous for both the environment and people's health. They say farmers growing GM crops have actually increased their use of farm chemicals. And the widespread use of the