阅读理解
A credit card can be useful. You can take it into a store and buy a television set or new furniture or clothing or anything you want. All you have to do is to sign your name and take what you want out of the store without paying cash. But there is a problem with the cards—they can be financial poison. These cards are just like the poison we use on insects. If we use them carefully, they can be helpful: but if we use them too much, they can kill us financially just as real poison can kill our body. For any money that the user does not pay each month, the credit card company charges a percentage of that amount in interest. The interest is added every month, so a bill that is not paid gets bigger and bigger. Over 10 percent of the families in the United States are "overextended". That is, they have more debts on their credit cards than they can pay. Credit cards can be used for almost anything that money can buy. And they can even be used to pay for funerals. For some credit card users, a funeral may be the only solution to the debt problems they have caused for themselves by using credit cards.
单选题
What do we know about credit cards according to the passage?
【正确答案】
B
【答案解析】推理判断题。由第一段最后一句“All you have to do is to sign your name and take what you want out of the store without paying cash．(你所要做的就是签上自己的名字，不用付现金就可以把你想要的东西带出商店)”可推知，使用信用卡的好处在于方便。
单选题
What' s the problem with credit cards mentioned in Paragraph Two?
【正确答案】
C
【答案解析】推理判断题。由第二段第三句“If we use them carefully，they can be helpful；but if we use them too much，they can kill us financially just as real poison can kill our body．(如果我们小心谨慎地使用信用卡，那么它很有用；可是如果我们过于频繁地使用它，它就有可能像毒药毒害我们的身体那样在经济上遏制我们)”可推知，信用卡可能会给人带来财务上的麻烦。
单选题
What happens to a credit card user if he fails to pay each month according to the passage?
【正确答案】
A
【答案解析】事实细节题。由第三段第一句“For any money that the user does not pay each month，the credit card company charges a percentage of that amount in interest．(对于那些消费者每月无法还的钱，信用卡公司会对那部分钱收取一定比率的利息)”可知。
单选题
The sentence "Over 10 percent of the families in the United States are ' overextended' " in Paragraph Four probably means______.