C51用“*”和“&”运算符来提取指针变量的（）和变量的（）
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C51有哪几种数据存储类型？其中数据类型“idata，code，xdata，pdata”各对应AT89S51单片机的哪些存储空间？
说明3种数据存储模式（1）SMALL模式（2）COMPACT模式（3）LARGE模式之间的差别
We tend to describe ______________ as hero today .
A. victims of all kinds of difficulties and tragedies
B. first responders off duty
C. survivors of all kinds of difficulties and tragedies
D. extraordinary political leaders such as Nelson Mandela
Two examples of heroes are given in paragraph 2-3 in order to ____________.
A. describe their heroic deeds
B. show ordinary people can be heroes too
C. show the critical moments that called for heroic deeds
D. anwer the questions in paragraph 1
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