[填空题]I.
A—air traffic control system J—safety precaution measure
B—armed police K—safety control device
C—crime prevention L—security command center
D—entry requirement M—security service
E—international criminal police organization N—security control center
F—level of security O—security personnel
G picket line P—valid documents
H—police station Q—security monitoring and control
I—patrolling vehicle

( ) 空中交通管制系统 ( ) 安全预防措

[填空题]I.
A—air traffic control system J—safety precaution measure
B—armed police K—safety control device
C—crime prevention L—security command center
D—entry requirement M—security service
E—international criminal police organization N—security control center
F—level of security O—security personnel
G picket line P—valid documents
H—police station Q—security monitoring and control
I—patrolling vehicle

( ) 入境要求 ( ) 安保人员

[填空题]

I.
A—air traffic control system J—safety precaution measure
B—armed police K—safety control device
C—crime prevention L—security command center
D—entry requirement M—security service
E—international criminal police organization N—security control center
F—level of security O—security personnel
G picket line P—valid documents
H—police station Q—security monitoring and control
I—patrolling vehicle

（）空中交通管制系统（）安全预防措

[填空题]

A——air traffic control system J——safety precaution measure
B——armed police K——safety control device
C——crime prevention L——security command center
D——entry requirement M——security service
E——international criminal police organization N——security control center
F——level of security O——security personnel
G——picket line P——valid documents
H——police station Q——security monitoring and control
I——patrolling vehicle
Examples:(M)保安服务 (G)警戒线

（）巡逻车（）武装警察

[填空题]

A——air traffic control system   J——safety precaution measure
B——armed police     K——safety control device
C——crime prevention    L——security command center
D——entry requirement    M——security service
E——international criminal police organization N——security control center
F——level of security  O——security personnel
G——picket line   P——valid documents
H——police station Q——security monitoring and control
I——patrolling vehicle
Examples:(M)保安服务 (G)警戒线

（）空中交通管制系统（）安全预防措施

[填空题]Air Traffic Control started after the Grand Canyon crash in 1956.

[单项选择] Conversation 2A) By a central control system. C) By several separated computers.
B) By a mechanical ann. D) By a few people.

[单项选择]Passage One
A. Air traffic conditions. B. Traffic jams on highways.
C. Road conditions. D. New traffic rules.

[填空题]Efficient air conditioning system will help maximize the distance an electric cur can cover.