制作立方体过程中，为了保持三张图片的一致性，要先进行对齐操作，才能裁剪出一致的部分。
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What is "my son" perhaps right about?
A. I am the only parent who still corrects his childr's English.
B. I am a boring and strange parent.
C. I like grammar.
In para. 2, I got serious about this only recently..., what does "this" refer to________?
A. my son doesn't seem to like grammar.
B. my son doesn't like me.
C. my former student didn't give me a satisfying answer.
The tone of "that was it " in para. 4 is_____
A. excited
B. disappointed
C. satisfied
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