杨老(lǎo )师也很(hěn )得意,拍拍手上的粉笔灰,刚要(yào )往下说,就在(zài )这时,高压(yā )锅发出“砰”的一声巨响(xiǎng ),爆炸了!同学们惊恐万分,盯着讲台看,不一会儿,只见杨老师在(zài )烟雾中(zhōng )站起(qǐ )来,他愣(lèng )了半天,才转(zhuǎn )过身去(qù ),这次,他(tā )一脸痛苦地在黑板上缓(huǎn )缓地写(xiě )道:学(xué )习要有压力(lì ),但也不能(néng )太大!
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