女性，32岁，活动后心悸气短3年余，夜间不能平卧，咳嗽，咳粉红色泡沫样痰1小时而来诊。1周前发热，咽痛，咳嗽，呼吸30次/min，双肺布满干湿性啰音，心界向两侧扩大，心尖部2/6级收缩期吹风样杂音。

发病的病因是（）

A.急性心肌炎

B.高血压性心脏病

C.扩张型心肌病

D.心包炎

E.甲亢

Most computer systems are (16) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (17) to an outsider attack by preventing.
(18) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (19) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (20) by tools referred to as Intrusion Detection Systems.

A．visit

B．access

C．I/O

D．read/write