Hide Edges命令的作用是（）

A:显示对象 B:隐藏对象 C:显示边缘 D:隐藏边缘

In an interview last month, Frank Church, chairman of the Senate committee that is investigating the CIA, issued an oblique but impassioned warning, that the technology of eavesdropping had become so highly developed that Americans might soon be left with "no place to hide". That day may have arrived. Newsweek has learned that the country’s most secret intelligence operation, the National Security Agency, already possesses the computerized equipment to monitor nearly all overseas telephone calls and most domestic and international printed messages.
The agency’s devices monitor thousands of telephone circuits, cable lines and the microwave transmissons that carry an increasing share of both spoken and written communications. Computers are programed to watch for "trigger" words or phrases indicating that a message might interest intelligence analysis, when the trigger is pulled, entire messages are tape-recorded or printed out.
That kind of eavesdropping is, however, relatively simple compared with the breakthroughs that lie ahead in the field of snoopery. Already it is technically feasible to "bug" an electric typewriter by picking up its feeble electronic emissions from a remote location and then translating them into words. And some scientists believe that it may be possible in the future for remote electronic equipment to intercept and "read" human brain waves.
Where such capabilities exist, so too does the potential for abuse. It is the old story of technology rushing forward with some new wonder, before the man who supposedly control the machines have figure out how to prevent the machines from controlling them.
Which is the best title for the passage

A:Fight Against Eavesdropping B:A New Breakthrouth C:No Place to Hide D:An Impassioned Warning

Text 1

A:Fight Against Eavesdropping B:A New Breakthrouth C:No Place to Hide D:An Impassioned Warning

Hide behind the cubes during an attack you can ______.

A:let them shoot over you without any danger B:be certain of hitting your target (靶子) C:easily shoot from behind them D:fire straight at your enemy

The Street Violinist (小提琴手)
I got up and dressed, stuck my violin under my jacket, and went out into the streets to try my luck. I wandered about for an hour, looking for a likely spot, feeling as though I were about to commit a crime. Then I stopped at last under a bridge near the station and decided to have a try.
I felt tense and nervous. It was the first time, after all. I drew the violin from under my coat like a gun. It was here, in Southampton, with trains rattling (咔嗒咔嗒地行驶) overhead, that I was about to declare myself. One moment I was part of the hurrying crowds, the next I stood apart, my back to the wall, my hat on the pavement before me, the violin under my chin.
The first notes (音符) I played’ were loud and raw, like a declaration of protest, then they settled down and began to run more smoothly and to stay more or less in tune. To my surprise I was neither arrested nor told to shut up. Indeed, nobody took any notice at all. Then an old man, without stopping, surreptitiously (偷偷摸摸地) tossed a penny into my hat as though getting rid of some guilty evidence.
I worked the streets of Southampton for several days, gradually acquiring the truths of the trade by trial and error. It was not a good thing, for instance, to let the hat fill up with money - the sight could discourage the patron: nor was it wise to empty it completely, which could also confuse him; giving him no hint as to where to drop his money. Placing a couple of pennies in the hat to start the thing going soon became a regular ritual, making sure, between tunes, to hide most of the earnings, but always leaving two pennies behind.
Old ladies were most generous, and so were women with children, shopgirls, typists and barmaids (酒吧女招待). As for the men: heavy drinkers were always willing listeners and so were big guys with muscles. But never a man with a gentleman’s hat, briefcase or dog:’ respectable types were the meanest of all. Except for retired army officers, who would yell "Why aren’t you working, young man" and then toss some money into the hat to hide their confusion.
The retired army officers gave him money

A:to show they were most generous. B:to show they were most respectable. C:to hide their confusion. D:to show they were rich.

The Street Violinist
I got up and dressed, stuck my violin under my jacket, and went out into the streets to try my luck. I wandered about for an hour, looking for a likely spot, feeling as though I were about to commit a crime. Then I stopped at last under a bridge near the station and decided to have a try.
I felt tense and nervous. It was the first time, after all. I drew the violin from under my coat like a gun. It was here, in Southampton, with trains rattling overhead, that I was about to declare myself. One morning I was part of the hurrying crowds, the next I stood apart, my back to the wall, my hat on the pavement before me, the violin under my chin.
The fist notes I played were loud and raw, like a declaration of protest. Then they settled down and began to run more smoothly and to stay more or less in turn. To my surprise I was neither arrested nor told to shut up. Indeed, nobody took any notice at all. Then an old man, without stopping, surreptitiously tossed a penny into my hat as though getting out of some guilty evidence.
I worked the streets of Southampton for several days, gradually acquiring the truths of the trade by trial and error. It was not a good thing, for instance, to let the hat fill up with money—the sight
could discourage the patron. Nor was it wise to empty it completely, which could also confuse him, giving him no hint as to where to drop his money. Placing a couple of pennies in the hat to start the thing going soon became a regular ritual, making sure between tunes, to hide most of the earnings, but always leaving two pennies behind.
Old ladies were most generous, and so were women with children, shopgirls, typists and barmaids. As for the man, heavy drinkers were always willing listeners and so were big guys with muscles. But never a man with a gentleman’s hat, briefcase or dog. Respectable types were the meanest of all. Except for retired army officers, who Would yell "Why aren’t you working, young man" and then toss some money into the hat to hide their confusion.
The retired army officers gave him money

A:to show they were most generous B:to show they were most respectable C:to hide their confusion D:to show they were rich

? ?下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案填在题前的括号内。
{{B}}第一篇{{/B}}

A:to show they were most generous B:to show they were most respectable C:to hide their confusion D:to show they were rich