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问题 单项选择题

女，24岁，劳累后心慌气短5年，近1年来症状加重，X线显示主动脉增宽，左室增大，心腰凹陷，似“靴形”，应首先考虑（）。

A.心肌炎

B.冠心病

C.心包积液

D.风心病，二尖瓣狭窄

E.二尖瓣狭窄并主动脉瓣关闭不全

答案

参考答案：E

完形填空

Do you find that when you are busy with your study on the Internet, the speed of your computer slows down   小题1:  sometimes? It is probably because your computer gets infected by virus (病毒), which can make it more difficult for you to use the computer. How to keep viruses小题2: your computer is a problem now. But in fact, nothing can ensure (保证) the security of your computer one hundred percent. There are, somehow some things you can do to  小题3: your computer’s security system and decrease (降低) the possibility of an infection.

You can   小题4: your system up to date with the current anti-virus software (反病毒软件), and use the following methods
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单项选择题

下面哪个不是下颌骨薄弱部位

A．髁状突颈部

B．下颌角

C．颏孔区

D．喙状突颈部

E．正中联合
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