中國網(wǎng)站品牌欄目（頻道）
A fifth grader looked downcast, so her teacher asked, "What's the problem, Carol? I hope it's not homework again."
"Well, uh, yes, it is." replied Carol. "I was stupid and made my homework paper into a paper airplane."
"Carol, you're right, that wasn't a very bright thing to do," said the teacher, "but this once I'll let you just unfold the paper and hand it in."
"Oh, but that won't work," said Carol, looking even sadder. "You see, the plane was hijacked."
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