14．(2017·湖南“五市十校”高三联考)It is important to be precise when calculating these figures, ________ even a small mistake can cost us millions of dollars.

　　答案：as/because　解析：考查原因状语从句。句意：计算这些数据的时候精确是非常重要的，因为即使一个小小的错误都会让我们损失数百万美元。as/because意为“由于，因为”。

　　15．(2017·南京高三模考)There can be no equality of opportunity ________ everyone follows the rules at their own game.

　　答案：unless　解析：考查条件状语从句。句意：除非每个人在他们自己的游戏中都遵守规则，否则就不可能有公平的机会。unless表示“如果不，除非”，符合句意。

　　Ⅱ.阅读理解(史地人文类)

　　Many people think of credit cards as a modern­day convenience, but the history of the earliest credit cards actually dates back to the early 1900s. The first credit card was invented in 1946 by a banker named John Biggins, who called it the “Charg－It” card. When a customer used the “Charg－It” card, a bill for that person's purchase was also sent to his bank for review. Instead of the customer paying the shopkeeper directly, the bank would pay them. However, all purchases had to be made locally and anyone with the “Charg－It” card had to be an actual customer of Biggin's bank.

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