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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.
Arctic foxes dig out a deep burrow when winter comes as

A. the place to escape from the winter cold.
B. the place to store food for their children.
C. the place to give birth to children.
D. the place to escape other animals’s laughter.
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By the way, if you are wondering where the Bluetooth name originally carne from, it is named after a Danish Viking and King, Harald Blaatand (translated as Bluetooth in Englishl. who lived in the latter part of the 10[th] century. Harald Blaatand united and controlled Denmark and Norway (hence the inspiration on the name: uniting devices through Bluetooth). He got his name from his very dark hair which was unusual for Vikings, Blaatand means dark complexion. However, a more popular, ( but less likely reason) , was that Old Harald had an inclination towards eating Blueberries ,so much so his teeth became stained with the color, leaving Harald with a unique set of molars (白齿). Who was Harald Blaatand
A. A Viking pirate in the 10[th] century.
B. The king of Denmark for most part of the 10[th] century.
C. The king ruling Denmark for the latter part of the 10th century.
D. A typical Viking who had very dark hair.
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How does it happen that children learn their mother tongue so well When we compare them with adults learning a foreign language, we often find this interesting fact. A little child without knowledge or experience often succeeds in a complete mastery of the language. A grown-up person with fully developed mental powers, in most cases, may end up with a faulty and inexact command. What accounts for this difference Despite other explanations, the real answer in my opinion lies partly in the child himself, partly in the behavior of the people around him. In the first place, the time of learning the mother tongue is the most favorable of all, namely, the first years of life. A child hears it spoken from morning till night and, what is more important, always in its genuine form, with the right pronunciation, right intonation, right use of words and right structure. He drinks in all the words and expressions which come to him in a flesh, ever—bubbling spring. There is no resistance: there is perfect assimilation. Accounts for in the last sentence of the first paragraph can be best replaced with
A. makes for
B. excuses for
C. explains
D. tells
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