shell是一种高级编程语言，也可以是一个命令解释器。
A. 对
B. 错
Shell不是Linux操作系统的核心与用户程序间的一个接口。
A. 对
B. 错
[音频]Why did most Americans aged 18-29 choose not to use credit cards?
A. it is inconvenient to repay the debts.
B. it is difficult to get a credit card.
Credit cards may cause problems.
D. Their parents didn't like them to have credit cards.
What was Bivera(里维拉，人名） advised to do ？
A. Get married when she is not in debt.
B. Pay off her credit card as soon as possible.
C. Avoid making the mistakes her parents have made.
D. Put off getting a credit card as long as possible.
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