单选题The symbol ☆ represents one of the fundamental arithmetic operators：+, -, ×, or ÷. If (x☆y)÷(y☆x)=1 for all positive values of x and y, then ☆ can represent ______.A + onlyB ÷onlyC + or × onlyD - or × onlyE +, -, ×, ÷

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单选题

The symbol ☆ represents one of the fundamental arithmetic operators：+, -, ×, or ÷. If (x☆y)÷(y☆x)=1 for all positive values of x and y, then ☆ can represent ______.

+ only

÷only

+ or × only

- or × only

+, -, ×, ÷

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美国学术能力评估考试（SAT）

单选题The symbol ☆ represents one of the fundamental arithmetic operators：+, -, ×, or ÷. If (x☆y)÷(y☆x)=1 for all positive values of x and y, then ☆ can represent ______.A + onlyB ÷onlyC + or × onlyD - or × onlyE +, -, ×, ÷

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