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【简答题】
C语言中,全局变量是不在任何函数之内定义的变量,它的作用范围是从________开始到所在文件结束。
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反馈参考答案：
举一反三
【单选题】Which of the following statements is supported by the passage?
A.
A scientist's most difficult task is testing hypotheses.
B.
It is better to revise a hypothesis than to reject it.
C.
Theories are simply imaginary models of past events.
D.
A good scientist needs to be creative.
【单选题】They didnt feel the least bit frustrated even when they were confronted with ______difficulties.
A.
grave
B.
fantastic
C.
temporary
D.
implicit
【简答题】下列各组物质中，前者属于纯净物、后者属于混合物的是（ ） A．氮气、蒸馏水 B．矿泉水、稀盐酸 C．牛奶、碳酸钙 D．二氧化碳、空气
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