PTSD是（)。

e the quality of our system’s structure.

Transit has its own police force committed to the safety of its customers and drivers，serving seven counties and 85 cities in the region.There are 23 full-time officers，146 part-time of officers and five administrative(行政的) staff，devoted to one thing：public safety.

You’ve probably seen Transit Police officers patrolling(巡逻) bus routes in cars or on foot.During visits drivers.Transit police either ride along or they step on board to greet drivers and passengers. Sometimes officers patrol out of uniform--one could be on your next bus.The fare inspectors on HiaWatha light-rail trains are Transit Police officers.

Every new Public Transit bus has all on board security camera.Videotapes from these cameras help Transmit Police identify and charge criminals.

Downtown patrols built up in early 2002 have improved the quality of life for downtown residents and transit customers.Ten full-time police officers are assigned to the Minneapolis and St.Paul downtown areas，to ensure public security.

Downtown arrests have gone from 490 in April-September 2001 to 941 during the same period in 2002.

21.The responsibility of the police force of Public Transit is to____.

A)enhance public security

B)build a free transit system

C)control the number of riders

D)ensure a convenient transit system

22.Sometimes patrolling officers on buses are unnoticed because____.

A)they look like fare inspectors

B)they don’t wear uniform

C)they are polite to passengers

D)they often take a back seat

23.The purpose of installing a camera inside the new buses is to____.

A)keep a close watch over the road ahead

B)take pictures of the passengers on road

C)increase the efficiency of the transit system

D)help the transit police detect criminals

24.Two figures are mentioned in the last paragraph to indicate____.

A) the Public Transit system’s efficiency

B)the success of Transit Police program

C)the police’s emphasis on security of downtown areas

D)the worsening security condition of the area

25.The best tire for the passage might be____.

A) Police and Security

B)New Security Measures

C)Transit Police Security Program

D)Crime-free Public Transit System

A、五台山

B、恒山

C、云冈石窟

D、平遥古城

A、狗不理包子

B、天津茶汤

C、耳朵眼炸糕

D、全聚德烤鸭

A、黄山

B、华山

C、龙虎山

D、泰山

A、广西

B、云南东部

C、贵州

D、陕西

E、四川

A、中华鲟

B、扬子鳄

C、海豚

D、大鲵

E、白鳍豚

A、蓝天

B、海岸

C、阳光

D、海水

E、沙滩

A、广东丹霞山

B、福建武夷山

C、山东泰山

D、承德棒槌峰

A、北京故宫博物院

B、中国国家博物院

C、军事博物馆

D、自然博物馆

E、陕西历史博物馆

F、西安碑林博物馆

A、北京故宫太和殿

B、曲阜孔庙大成殿

C、避暑山庄烟波致爽殿

D、岱庙天贶殿