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【单选题】
第一心音形成的主要机制是A.
乳头肌的收缩
B.
房室瓣开放
C.
二尖瓣和三尖瓣关闭
D.
心室壁的震动
E.
半月瓣关闭
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举一反三
【简答题】The UN Security Council is made up of five permanent members and ______ non-permanent members.
【单选题】The Social Security Retirement Program is made up of two trust funds, ______ could go penniless by next year.
A.
the larger one
B.
the larger of which
C.
the largest one
D.
the largest of which
【单选题】Which of the following is NOT true of security attacks?
A.
Employees will keep up with security polices and awareness if they are highly-trained.
B.
The rate of security attacks appears faster than the growth of the Internet.
C.
One's computer system will never be fully secure.
D.
Vulnerabilities can go through phones, wireless devices, and network appliances.
【单选题】The suitcase of the woman speaker’s colleague was blown up by the security police probably because ______.
A.
it failed to pass the security check
B.
it was suspected of containing a bomb
C.
it contained dirty disease-carrying clothes
D.
it was suspected of containing smuggled goods
【单选题】Which of the following is NOT true of security attacks?
A.
Employees will keep Up with security polices and awareness if they are highly-trained.
B.
The rate of security attacks appears faster than the growth of the Internet.
C.
One's computer system will never be secure.
D.
Vulnerabilities can go through phones, wireless devices, and network appliances.
【单选题】The events of Sept. 11 have ratcheted up security at American airports to the highest level ever, according to a spokesman for Transportation Secretary Norman Mineta. But to say there is plenty of roo...
A.
using false ID
B.
helping others in smuggling
C.
being in the US illegally
D.
denying or not mentioning past crimes
【单选题】The suitcase of the female speaker's colleague was blown up by the security police probably because
A.
it failed to pass the security check.
B.
it was suspected of containing a bomb.
C.
it contained dirty disease-carrying clothes.
D.
it was suspected of containing smuggled goods.
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