Which letter is a kind of drink and which letter is difficult to understand?

Which letter is a kind of drink and which letter is difficult to understand?

题目
Which letter is a kind of drink and which letter is difficult to understand?
A:T AND Y
B:W AND Z
C:S AND X
D:I AND N
答案
答案是A
因为"T"(TEA)是一种饮料,"Y"(WHY)是不懂才会问的.
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