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问题 单项选择题

慢性冠状动脉供血不足的心电图表现是( )

A．窦性心动过缓及过早搏动
B．窦性心动过缓
C．频发早搏
D．ST段明显下降，T波倒置
E．ST段上抬，心律失常

答案

参考答案：D

改错题

短文改错

Yesterday a school boy is daydreaming in class.Not knowing that he was doing, he put a pen cap

into his mouth.A few minutes late, he was terrified to find that he had swallowed it!The teacher was

shocking when the boy stood up and said, "I've just swallowed a pen cap."He was quickly sent the

nearest hospital.There a doctor examined his and said the best treatment was to take some medicines

so that the pen cap could pass natural.Three hours later the boy successfully made it."She is really lucky, " said the doctor."It's not rare that small children put things into their mouths for a fun.It's very danger."

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单项选择题

2008年前后我国部分地区婴幼儿饮用牛乳后出现结石宝宝的主要原因是（）。

A.重金属污染

B.三聚氰胺污染

C.防腐剂甲醛污染

D.黄曲霉毒素污染

E.塑化剂污染
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