The police were warned to be more careful when making their （investigate) ______.

听力原文： Police in London now say that more than 50 people died in yesterday's terrorist bombings and warn that the death toll could rise. Police also said that there were no more than four explosive devices involved, three on underground trains and one on a bus, and they estimated that all the bombs were relatively small containing about 10 pounds of high explosive. Commissioner Blair also denied there was any evidence to suggest that the attacks were carried out by suicide bombers but said the possibility could not be ruled out. Police said they received no warning about the attacks and would not speculate on a claim by a group calling itself "The Secret Organization of A1-Qaida in Europe" that it was behind the bombings.

We know for sure that _______.

A．50 people died in the terrorist bombing

B．there were four explosive devices involved in the terrorist bombing

C．the attacks were not carried out by suicide bombers

D．The Secret Organization of A1-Qaida will not be speculated on by London Police

bombings and warn that the death toll could rise. Police also said that there were no more than four explosive devices involved, three on underground trains and one on a bus, and they estimated that all the bombs were relatively small containing about 10 pounds of high explosive. Commissioner Blair also denied there was any evidence to suggest that the attacks were carried out by suicide bombers but said the possibility could not be ruled out. Police said they received no warning about the attacks and would not speculate on a claim by a group calling itself "The Secret Organization of Al-Qaida in Europe" that it was behind the bombings.

We know for sure that ______.

A．50 people died in the terrorist bombing

B．there were four explosive devices involved in the terrorist bombing

C．the attacks were not carried out by suicide bombers

D．The Secret Organization of Al-Qaida will not be speculated on by London Police

A.not to go out

B.not go out

C.going out

D.go out

What is the traditional way for the campus police to ensure security on Saturdays？

A．To patrol the campus regularly.

B．To check the students' website.

C．To monitor noises on the campus.

D．To warn the students in advance.

ciety.In fact, when we go about our everyday lives itis virtually impossible to avoid it.If you take a bus to school, there will bea camera on it.When you pop out to the supermarket to buy some bread, a camerawill be watching you walk around the shop.If you look up, you'll see camerason many street corners, at bus stops, on trains and even in some publictoilets.We seem to have developed an obsession (迷恋) with them!

In 2013, an article published in The Guardian (a British newspaper)stated that there was 1 camera for every 11 people in Britain.There are estimatedto be around 6 million CCTV cameras across Britain - now that's a lot ofcameras! Thanks to our apparent love of CCTV, Britain has been nicknamed the"surveillance state".

CCTV is a vital tool for the police and can help solve crimes - anotable example would be the James Bulger case from 1993.CCTV images meantthat the two boys who committed the crime were caught and prosecuted.However,CCTV does not always have all the answers.Sometimes the images aren't clearenough to identify people; often, criminals obscure their faces to avoid beingcaught.Recently, some talking CCTV cameras have been installed in the UK.These react to movement, and warn criminals that their photo has been taken.

In my opinion, CCTV has gone too far.As a nation, we rely on it fartoo much.At what point did we decide to replace police officers withtechnology？ Many people claim to feel safer as a result of CCTV; if more policewere around I'm sure they'd feel just as safe! Many schools across Britain haveinstalled CCTV - in classrooms, toilets and changing rooms.They say it helpsto prevent bullying - but surely something else could be done instead？

26.According to Paragraph 1, CCTV________

A.can be easily avoided

B.is widely used in society

C.can be bought in supermarket

D.makes public streets much safer

27.The word “surveillance” (Para.2)probably means “________”.

A.monitor

B.safety

C.crime

D.public

28.Why does the author mention the JamesBulger case？()

A.It is a well-known case in the UK

B.It proves the importance of CCTV

C.It is a lesson for the British police

D.It warns of the danger from boycriminals

29.According to the passage, the talkingCCTV cameras__________.

A.do not have clear images

B.help find hidden criminals

C.can identify dim faces

D.give warnings to criminals

30.What is the author's attitude towards CCTV？()

A.Positive

B.Negative

C.Objective

D.Unclear

A.signs

B.signals

C.symbols

D.marks

A.convince

B.inform

C.warn

D.convict

The first lighthouse used ______ to warn ships when they were near the harbor.

A．fire

B．oil light

C．electric lamps

A.signs

B.signals

C.symbols

D.marks

A.To emphasize the hazards of wooden buildings.

B.To explain why certain building techniques were firstly applied in Chicago.

C.To warn against building skyscrapers close together.

D.To explain how Chicagos early skyscrapers were destroyed.

A.is

B.were

C.are

D.was