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6£®On the morning of October 12£¬1492£¬Christopher Columbus and his crew came to the shores of the Caribbean islands£¬mistakenly believing they ________ in Southeast Asia£®£¨¡¡¡¡£©
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17£®Ever wonder why sometimes a hug is all you need£¿You can't explain it£¬but there's just something comforting about being in your wife's arms after a rough day or giving mom a hug after a long time apart£®
A new study says the warm feeling in a hug is more than just skin deep£®Researchers from the University of California£¬Berkeley believe that this loving feeling could have anti-aging benefits£®
Oxytocin£¬sometimes referred to as the"love hormone£¨ºÉ¶ûÃÉ£©"or the"trust hormone"£¬is responsible for those indescribable feelings we get when we're bonding with a lover or a loved one£®
Levels of the hormone drop as we age£¬and evidence suggests that could be a contributing factor to the  deterioration of our bodies as we age£®Muscle loss in particular is one of the major side effects of aging£¬with our bodies losing up to 5percent of our muscle mass each decade past our 30s£®
In the study£¬published in the journal Nature Communications£¬researchers injected oxytocin into older mice with muscle damage£®The older mice had lower levels of the hormone than younger mice initially£®But after nine days£¬the older mice that were given the hormone healed better than those who did not£®In fact£¬their ability to repair muscle damage was up to 80percent that of the younger mice£®
The results were not only fast-acting£¬but provide hope for future uses of the hormone in a variety of anti-aging capacities£®"This is good because it demonstrates that extra oxytocin improves aged tissue stem cells£¨×éÖ¯¸Éϸ°û£©without making muscle stem cells divide uncontrollably£¬"study co-author Wendy Cousins said in a statement£®
Previous uses of anti-aging molecules have also been associated with higher cancer risk£¬but researchers are hopeful that oxytocin can be useful in humans without this risk£®In the future£¬researchers of Berkeley say oxytocin could be used to fight other age-related health issues by improving bone health and even being used as an alternative to hormone replacement therapy£®
Now go out and give someone a hug£®

33£®According to the passage£¬oxytocinA£®
A£®decreases when people get older
B£®creates loving feeling on the skin
C£®leads to the great loss of muscles
D£®can be used in humans without any risk
34£®The underlined word"deterioration"in Paragraph 4probably refers to the state ofB£®
A£®getting fatter
B£®becoming worse or less
C£®growing stronger
D£®dividing uncontrollably
35£®What can be learned from the research£¿D
A£®All the older mice healed faster in the research£®
B£®Older mice healed better than younger ones after 9days£®
C£®Extra oxytocin in older mice controlled muscle cell division£®
D£®Mice with oxytocin injection improved the ability to repair muscle damage£®
18£®Cancun is a seaside town in Mexico£¬where most tourists come here to enjoy the beach£¬water sports and night life£®In fact£¬it is so modern and Americanized that you might think you were in southern California or Florida£®
But just a short two-hour hike from the town lie the ruins of the city of Chichen-Itza£¬one of the capitals of the lost Maya£¨ÂêÑÅ£©civilization£®The center of the ruins of this city is the pyramid of El Castillo£®The ancient Mayan religious people climbed this pyramid during festival to honor the Sun god£®Tourists today climb it to view the architectural achievements of Chichen-Itza and to prove their fearlessness of heights and steep £¨¶¸Ç͵ģ©climbs£®There is a sign in Spanish£¬admonishing visitors"It's dangerous to go up£®"I gladly ignored it and started my climb£®
The climbing was tough£®The steps were higher than one might normally take£®£¬but the climb was not fearful at all£®From the top of the pyramid£¬I had a wonderful view of the ruins of this Mayan city£®What was most striking to me was that just beyond the ruins of splendid structures£¬gardens£¬temples and what looks like a modern sports stadium£¬you could only see forests for miles and miles£®It was almost as if some race had mysteriously come out of nowhere£¬built it up and then suddenly disappeared from the planet£¬leaving only stones in its space£®
The only remains on the top of the pyramid were the Temple of Kukulcan£®During the festivals to worship the Sun god£¬only the high ranks would have the right to enter this temple£®
After shooting a few pictures£¬I realized it was time to go down£®Only then did I discover that what people fear about the climb is not the trip going up£¬but the way going down£®I saw a few brave souls who were walking down as if they were in their own house£®Looking down at the steepness of the pyramid£¬I desperately feared this great height£®My first desire was to joke with a few people£¬"Where is the elevator£¨µçÌÝ£©£¿"I figured that a civilization that was this advanced would have had the foresight£¨Ô¤¼û£© to construct an elevator£®Lacking such modern equipment£¬I had to use the chain provided by the Mexican tourist authorities and climb down on all fours£®
My climb was complete eventually£®I quickly got on the bus back to my comfortable hotel£®Leaving the ruined city£¬I was still wondering what possibly happened long ago£®But a few hours later£¬I was back in the modern world drinking cocktails on the beach£¬bathing in the sunshine before boarding the plane and waiting for my trip back home to the US£¬where all the modern things such as elevators are available!
62£®Why did the writer pay a visit to the ruined city of Chichen-Itza£¿A
A£®He wanted to climb the pyramid of EL Castillo and know about the Mayan civilization£®
B£®He would got to the Temple of Kukulcan to attend a religious festival to honor the Sun god£®
C£®He thought the city of Chichen-Itza was quite different from the modern town of Cancun£®
D£®He was attracted by the ruined ancient buildings there and wanted to take some photos£®
63£®The underlined word"admonishing"in Paragraph 2 probably means"C"£®
A£®urging          B£®forcing          C£®warning         D£®frightening
64£®Which of the following best shows climbing the pyramid of EL Castillo is a difficult task£¿D
A£®The steps are very high and it is much more scaring to climb to the top£®
B£®The climbing calls for courage and patience£¬and also takes a long time£®
C£®When tourist climb up to the top£¬there is no elevator to take them down£®
D£®The pyramid is high and steep£¬and climbing down is much more fearful£®
65£®From the last paragraph£¬we can infer that the writerB£®
A£®had a bad impression of the visit and decided to leave as soon as possible£®
B£®thought modernization could offer people comforts and conveniences£®
C£®got tired of the modern life and tried a different one in his own way£®
D£®enjoyed himself in the climb though it was very tiring and dangerous£®

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