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Anna comes from Russia. She is 17 years old. She’s going to stay with the Black family for a year. Anna comes to England because she wants to study English. She helps Mrs. Black（1）______________ housework and goes to English (2) _______________ every Wednesday and Friday afternoon.

Anna is now in London. Everything is new to her. She finds life is (3) _______________from that in Moscow. Some things are great in London, but many things are not so nice.  The shops are (4) _____________ in London than those in Moscow. But it’s very expensive to (5) ____________ breakfast in London.

下面是关于8259A可编程中断控制器的叙述，其中错误的是

A．8259A具有将中断源按优先级排队的功能

B．8259A具有辨认中断源的功能

C．8259A具有向CPU提供中断向量的功能

D．两片8259A级联使用时，可将中断源扩展到16级