单项选择题
下列关于外部变量的说法，正确的是 。
A、全局外部变量可以用于多个模块，extern只是声明而不是重新定义
B、外部变量是在函数外定义的变量，其作用域是整个程序
C、全局外部变量可以用于多个模块，但需用extern重新在各模块中再定义一次
D、静态外部变量只能作用于本模块，因此它没有什么实用价值
下列关于外部变量的说法，正确的是 。
A、全局外部变量可以用于多个模块，extern只是声明而不是重新定义
B、外部变量是在函数外定义的变量，其作用域是整个程序
C、全局外部变量可以用于多个模块，但需用extern重新在各模块中再定义一次
D、静态外部变量只能作用于本模块，因此它没有什么实用价值
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单项选择题
A 40-year old woman is unable remember where she lived or even her phone. She presents disoriented and confused. She is admitted for observation and testing and begins to hallucinate and salivate excessively. The woman had been bitten by a raccon. Which of the following is the most likely cause?
A 40-year old woman is unable remember where she lived or even her phone. She presents disoriented and confused. She is admitted for observation and testing and begins to hallucinate and salivate excessively. The woman had been bitten by a raccon. Which of the following is the most likely cause?
A．Measles
B．Prion
C．Rabies virus
D．HIV
E．Poliovirus