Dig是Linux系统中一个灵活的、强大的DNS辅助工具，我们可以使用它完成许多工作。例如，利用dig工具更新DNS根服务器的地址信息，避免因信息改变造成DNS的查询效率减慢。要完成这项工作，应该执行（）。

A:dig root-server.net.ns>/varamedameca B:dig @root-servers.net.ns>/varamedameca C:dig @root-servers.net.mx>/varamedameca D:dig @root-servers.netsoatxtchaosversion.bind

DIG易位型21-三体综合征最常见的核型是（）

A:46，XY(或XX)，一13，+t(13q21q) B:46，XY(或xx)，一14，+t(14q21q) C:46，XY(或xx)，一15，+t (15q2lq) D:46，XY(或xx)，一21，+t(21q2lq) E:46，xY(或XX)，一22，+t(21q22q)

The Body Thieves
In the early nineteenth century in Britain, many improvements were being made in the world of medicine. Doctors and surgeons were becoming more knowledgeable about the human body. Illnesses that had been fatal a few years before were now curable. However, surgeons had one problem. They needed dead bodies to cut up, or dissect (解剖). This was the only way that they could learn about the flesh and bones inside the body, and the only way to teach new surgeons to carry out operations.
The job of finding these dead bodies was carried out by an unpleasant group of people called "body snatchers". They went into graveyards (墓地) at night and, using wooden shovels to make less noise, dug up any recently buried bodies. Then they took the bodies to the medical schools and sold them. A body could be sold for between ￡5 and ￡10, which was a lot of money at that time. The doctors who paid the body snatchers had an agreement with them—they never asked any questions. They did not desire to know where the bodies came from, as long as they kept arriving.
The most famous of these body snatchers were two men from Edinburgh called William Burke and William Hare. Burke and Hare were different because they did not just dig up bodies from graveyards. They got greedy and thought of an easier way to find bodies. Instead of digging them up, they killed the poorer guests in Hare’s small hotel. Dr Knox, the respected surgeon they worked for, never asked why all the bodies they brought him had been strangled (勒死).
For many years Burke and Hare were not caught because, unsurprisingly, the bodies of their victims were never found by the police. They were eventually arrested and put on trial in 1829. The judge showed mercy to Hare and he was released but Burke was found guilty and his punishment was to be hanged. Appropriately, his body was given to the medical school and he ended up on the dissecting table, just like his victims. In one small way, justice was done.
Now, over 150 years later, surgeons do not need the help of criminals to learn their skills. However, the science of surgery could not have developed without their rather gruesome (令人毛骨悚然的) help.
Burke and Hare differed from other body snatchers in that

A:they got other people to dig up bodies for them. B:they sold the bodies only to one surgeon. C:they dug up bodies not just from graveyards. D:they resorted to murder to get bodies.

They tried to dig up something from the past.

A:find B:choose C:search D:look for

{{B}}第三篇{{/B}}

A:they got other people to dig up bodies for them. B:they sold the bodies only to one surgeon. C:they dug up bodies not just from graveyards. D:they resorted to murder to get bodies.

{{B}}第三篇{{/B}}

A:They leave their cosy burrows and migrate to warmer lands. B:They sleep soundly inside their burrows in winter. C:They dig out burrows and store them with enough food. D:They stay in their burrows and live on the food stored there.

第三篇 The Body Thieves In the early nineteenth century in Britain，many improvements were being made in the world of medicine．Doctors and Surgeons were becoming more knowledgeable about the human body．Illnesses that had been fatal a few years before were now curable．However, Surgeons had one problem．They needed dead bodies to cut up，or dissect(解剖)．This was the only way that they could learn about the flesh and bones inside the body。and the only way to teach new surgeons to carry out operations． 、 The job of finding these dead bodies was carried out by an unpleasant group of people called“body snatchers’’．They went into graveyards(墓地)at night and，using wooden shovels to make less noise。dug up any recently buried bodies．Then they took the bodies to the medical schools and sold them．A body could be sold for between￡5 and~10，which was a lot of money at that time．The doctors who paid the body snatchers had all agreement with t}them—they never asked any questions．They did not desire to know where the bodies came from，as long as they kept arriving． The most famous of these body snatchers were two men from Edinburgh called William Burke and William Hare．Burke and Hare were different because they did not just dig Up bodies from graveyards．They got greedy and thought of all easier way to find bodies．Instead of digging them up，they killed the poorer guests in Hare’s small hotel．Dr．Knox，the respected surgeon they worked for, never asked why all the bodies they brought him had been strangled(勒死)． 一 For many years Burke and Hare were not caught because，unsurprisingly, the bodies of their victims were never found by the police．They were eventually arrested and put on trial in 1 829.The judge showed mercy to Hare and he was released but Burke Was found guilty and his punishment was to be hanged．Appropriately, his body Was given to the medical school and he ended up on the dissecting table，just like his victims．In one small way,．justice was done． Now，over 150 years later, surgeons do not need the help of criminals to learn their skills．However，the science of surgery could not have developed without their rather gruesome(令人毛骨悚然的) help． Burk and Hare differed from other body snatchers in that

A:they got other people to dig up bodies for them． B:they sold the bodies only to one surgeon． C:they dug up bodies not just from graveyards． D:they resorted to murder to get bodies．

How Animals Keep Warm
Man has invented ways to keep warm, but how do animals defend themselves They cannot reason in the sense that man can, but nature has taken care of the animal kingdom by providing animals with special instincts. One of these instincts is known as hibernation.
"Sleeping like a dormouse" is not only a common saying but is a reality. When winter comes, the dormouse and other hibernating animals have reached a well-nourished state. They eat very well in warmer days laying down fat in the tissues of their bodies and during hibernation this keeps them alive. Safe in their nests, or burrows, they sleep soundly until the warmth of spring arrives.
Bats, tortoises, snakes, frogs, even insects like butterflies, hibernate more or less completely. Some, like the squirrels, sleep during coldest weather but are roused by a warm spell. During hibernation, the temperature of an animal’s body drops drastically. Breathing and heart-beats almost cease.
Another instinctive method of avoiding intense cold is to escape by means of migration. Wild swans, seagulls, swallows and cuckoos are a few of the very many kinds of birds which fly thousands of miles, twice a year, to avoid cold. Many animals, especially those of the Arctic reindeer of Europe, move southward towards the forests when winter approaches. They return to the northern area when the warmth of spring begins to be sensed.
There are animals which do not attempt to leave at the first sign of winter cold. Their instinctive means of defense is to dig out a deep burrow, made soft and warm by padding out with straw, leaves, moss and fur. In it they have a "secret place" containing food which they hope will last the winter through! Animals which fall into this class include the Arctic fox, the rabbit and the ermine, and the little field-mice.
How do ermines survive in winter

A:They leave their cosy burrows and migrate to warmer lands. B:They sleep soundly inside their burrows in winter. C:They dig out burrows and store them with enough food. D:They stay in their burrows and live on the food stored ther

The walrus uses its tusks to dig food from the ocean bottom.

A:floor B:environment C:islands D:waves