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单选题
破折号通常比连字符要长，但是有时候以连字符两边带有空格来显示。
A
A dash is usually longer than a hyphen but it is sometimes shown as hyphen with a space on each side.
B
A dash is usually longer than a connection symbol but it is sometimes shown as connection symbol with empty on each side.
C
A minus symbol is usually longer than a hyphen but it is sometimes shown as hyphen with a space on each side.
答案解析
正确答案：A
相关知识点：
破折号与连字符对比记
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