Workers aren't allowed to go into a big underground computer center until they step up to a machine that takes a quick picture of the tiny blood vessels (血管) inside their eyes.

    If the machine can't 1 the picture with images in its computer, the worker is stopped by security guards (保安员).

    Each person has his own way of blood vessels in his or her2.And unlike a key, the way can't be3.Old-fashioned keys and locks may soon be things of the past.High-tech security devices (安全装置) are being fixed at military (军事的) bases, computer centers and banks.Companies that 4 the machines say they'll someday be used in people's homes and cars.

    Already, a Japanese company has fixed ways that recognize (识别) people's fingerprints in 360 new homes.The machines open the doors only for the 5of the houses.The new security ways are selling well because thieves and robbers are getting better at breaking into buildings and computers that are 6 by keys and locks.Since nobody can steal or copy a fingerprint, or one's eyes, the new machines are 7.

    Other new machines recognize one's voice.Two American companies use 8 machines to keep an eye on their computers.Inexpensive voice-recognition machines may someday take the place of locks on cars.The doors would open only for the owners.The machines would 9 the owners as little as $270.Although the up-to-date machines are amazing, scientists must still solve a serious problem.How will a boy borrow his dad's car without borrowing his dad's 10?

    Workers aren't allowed to go into a big underground computer center until they step up to a machine that takes a quick picture of the tiny blood vessels (血管) inside their eyes.

    If the machine can't 1 the picture with images in its computer, the worker is stopped by security guards (保安员).

    Each person has his own way of blood vessels in his or her2.And unlike a key, the way can't be3.Old-fashioned keys and locks may soon be things of the past.High-tech security devices (安全装置) are being fixed at military (军事的) bases, computer centers and banks.Companies that 4 the machines say they'll someday be used in people's homes and cars.

    Already, a Japanese company has fixed ways that recognize (识别) people's fingerprints in 360 new homes.The machines open the doors only for the 5of the houses.The new security ways are selling well because thieves and robbers are getting better at breaking into buildings and computers that are 6 by keys and locks.Since nobody can steal or copy a fingerprint, or one's eyes, the new machines are 7.

    Other new machines recognize one's voice.Two American companies use 8 machines to keep an eye on their computers.Inexpensive voice-recognition machines may someday take the place of locks on cars.The doors would open only for the owners.The machines would 9 the owners as little as $270.Although the up-to-date machines are amazing, scientists must still solve a serious problem.How will a boy borrow his dad's car without borrowing his dad's 10?

    Workers aren't allowed to go into a big underground computer center until they step up to a machine that takes a quick picture of the tiny blood vessels (血管) inside their eyes.

    If the machine can't 1 the picture with images in its computer, the worker is stopped by security guards (保安员).

    Each person has his own way of blood vessels in his or her2.And unlike a key, the way can't be3.Old-fashioned keys and locks may soon be things of the past.High-tech security devices (安全装置) are being fixed at military (军事的) bases, computer centers and banks.Companies that 4 the machines say they'll someday be used in people's homes and cars.

    Already, a Japanese company has fixed ways that recognize (识别) people's fingerprints in 360 new homes.The machines open the doors only for the 5of the houses.The new security ways are selling well because thieves and robbers are getting better at breaking into buildings and computers that are 6 by keys and locks.Since nobody can steal or copy a fingerprint, or one's eyes, the new machines are 7.

    Other new machines recognize one's voice.Two American companies use 8 machines to keep an eye on their computers.Inexpensive voice-recognition machines may someday take the place of locks on cars.The doors would open only for the owners.The machines would 9 the owners as little as $270.Although the up-to-date machines are amazing, scientists must still solve a serious problem.How will a boy borrow his dad's car without borrowing his dad's 10?

—Take a map of Wuxi with you. You'll find it of great _________ in helping you to get round Wuxi.

—Take a map of Wuxi with you. You'll find it of great _________ in helping you to get round Wuxi.

    One of the most widely accepted assumptions (假设) in our culture is that if you exercise, you will lose weight．I exercise all the time, but I still have got fat．Why does this happen?

    More than 45 million Americans now belong to a health club, up from 23 million in 1993．We spend some $19 billion a year on sports．Of course, some people join the health club but never go．Still, as one main study—the Minnesota Heart Survey—found, more of us at least say we exercise regularly．

    However, the number of fat people has risen greatly: a third of Americans are fat, and another third count as overweight．Yes, it's highly possible that those of us who regularly go to the sports center would weigh even more if we exercised less．But like many other people, I get hungry after I exercise, so I often eat more on the days I exercise than on the days I don't．Could exercise actually be keeping me from losing weight?

    People believe that "exercise is important for weight control" is actually rather new．Doctors used to advise not to exercise too much, particularly for older adults who might hurt themselves．Today doctors encourage even their oldest patients to exercise because people who regularly exercise are at a lower risk for most illnesses, especially heart problems．They less often develop cancer and many other illnesses, but the role of exercise in weight loss has been completely overestimated (评估过高)．

    "In general, for weight loss, exercise is pretty useless," says an exercise researcher．

    Mr Jones, the owner of a farm, was one day driven out of the farm by all the animals he kept．The animals were excited to be masters of their farm．Animals made seven rules of their own and Snowball painted them on the wall．

    ⒈Whatever walks on two legs is an enemy;

    ⒉Whatever walks on four legs, or has wings, is a friend;

    ⒊No animal shall wear clothes;

    ⒋No animal shall sleep in bed;

    ⒌No animal shall drink alcohol(酒);

    ⒍No animal shall kill any other animal;

    ⒎All animals are equal．

    They were nicely written, except that "friend" was written "friend"．Snowball read them out, and all the animals agreed．

    "Now, let's go to the field．Let's get in the harvest more quickly than Jones and his men could do．"

    But at this moment the three cows, who had seemed uneasy for some time, shouted because they hadn't been milked for 24 hours．Then the pigs began to help milk the cows successfully．Soon there were five buckets (桶) of creamy milk at which many animals

    looked with great interest．"What's going to happen to all the milk?" asked one animal．"Jones used to mix some of it in our food," said one of the hens．"Never mind the milk," cried Napoleon, standing in front of the buckets, "the harvest is more important．Mr Snowball will lead the way, and I'll follow in a few minutes．"

    So the animals ran down to the field to begin the harvest, and when they came back in the evening, it was noticed that the milk had disappeared．

    Mr Jones, the owner of a farm, was one day driven out of the farm by all the animals he kept．The animals were excited to be masters of their farm．Animals made seven rules of their own and Snowball painted them on the wall．

    ⒈Whatever walks on two legs is an enemy;

    ⒉Whatever walks on four legs, or has wings, is a friend;

    ⒊No animal shall wear clothes;

    ⒋No animal shall sleep in bed;

    ⒌No animal shall drink alcohol(酒);

    ⒍No animal shall kill any other animal;

    ⒎All animals are equal．

    They were nicely written, except that "friend" was written "friend"．Snowball read them out, and all the animals agreed．

    "Now, let's go to the field．Let's get in the harvest more quickly than Jones and his men could do．"

    But at this moment the three cows, who had seemed uneasy for some time, shouted because they hadn't been milked for 24 hours．Then the pigs began to help milk the cows successfully．Soon there were five buckets (桶) of creamy milk at which many animals

    looked with great interest．"What's going to happen to all the milk?" asked one animal．"Jones used to mix some of it in our food," said one of the hens．"Never mind the milk," cried Napoleon, standing in front of the buckets, "the harvest is more important．Mr Snowball will lead the way, and I'll follow in a few minutes．"

    So the animals ran down to the field to begin the harvest, and when they came back in the evening, it was noticed that the milk had disappeared．

    Mr Jones, the owner of a farm, was one day driven out of the farm by all the animals he kept．The animals were excited to be masters of their farm．Animals made seven rules of their own and Snowball painted them on the wall．

    ⒈Whatever walks on two legs is an enemy;

    ⒉Whatever walks on four legs, or has wings, is a friend;

    ⒊No animal shall wear clothes;

    ⒋No animal shall sleep in bed;

    ⒌No animal shall drink alcohol(酒);

    ⒍No animal shall kill any other animal;

    ⒎All animals are equal．

    They were nicely written, except that "friend" was written "friend"．Snowball read them out, and all the animals agreed．

    "Now, let's go to the field．Let's get in the harvest more quickly than Jones and his men could do．"

    But at this moment the three cows, who had seemed uneasy for some time, shouted because they hadn't been milked for 24 hours．Then the pigs began to help milk the cows successfully．Soon there were five buckets (桶) of creamy milk at which many animals

    looked with great interest．"What's going to happen to all the milk?" asked one animal．"Jones used to mix some of it in our food," said one of the hens．"Never mind the milk," cried Napoleon, standing in front of the buckets, "the harvest is more important．Mr Snowball will lead the way, and I'll follow in a few minutes．"

    So the animals ran down to the field to begin the harvest, and when they came back in the evening, it was noticed that the milk had disappeared．