摘要:B.

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B
What weighs 3500 pounds(1600kg)and lived 60 million years ago?Are you thinking of
dinosaurs?Guess again!You don,t have to go to a museum to see these creatures.They are alive
and swimming in the warm coastal waters of Florida.
Manatees(海牛)have lived a peaceful existence in the warm waters  of  Florida  for  60
million years.However,they are now an endangered species.This means that if humans don,t do
something to save them,they will soon go the way of dinosaurs.
Humans have made life very difficult for manatees.One big danger that humans have
introduced is the speedboat.Because manatees are mammals.they need to come to the surface to breathe about every 5 to 6 minutes.This means that they are in constant danger of being caught in the propellers(螺旋桨)of speedboats.And boating aceidents are the greatest cause of death for them.
Manatees are in extra danger when they are in their sleeping or“torpor”state.They still
have to come to the surface for the air,but sometimes they are too sleepy to avoid the danger of approaching boats.
Another danger for manatees is the pollution that humans produce.Due to human pollution,
a deadly plant called red tide had increased greatly in the Gulf of Mexico.The plant,or algae,
t11riVes(繁茂)on pollution.It wiped out nearly 20 percent of the total manatee population on
earth.
Humans can help to save manatees。The government has established boating speed limits to
give the manatees.a chance to escape approaching speedlsoats.Everyone can help by cutting
down on waste and pollution to protect the waters for the manatees.
One famous singer,Jimmy Buffet,has helped save the manatees.He co-founded the Save the Manatee Club(SMC).SMC had begun an adoption(收养)program for the manatees.For a fee,sponsors(资助者)can name a manatee.Donations are used to help protect the manatees and their habitat.
45.The manatee is the kind of animal that___________.
A.1ikes living in the cold waters of Florida      B.will die out if not protected in time
C.call dive in the deep sea for hours             D.is the biggest living animal on earth
46.Why is it dangerous for manatees to be in a torpor state?
A.Because they come to the snlface to breathe,and that is when they are hunted.
B.Because they eat deadly algae,and this makes them too sick to avoid danger.
C.Because they live in groups and therefore they are easily hurt by passing boats.
D.Because they are sleepy when they surface,so they can,t avoid approaching boats.
47.The death of the manatees is largely due to__________.
A.human hunting                       B.human pollution
C.speedboat accidents                  D.deadly plants
48.To help protect manatees,people should_________.
A.never go speed boating in their living habitat
B.keep the waters of Florida free from pollution
C.have manatess named by sponsors without a fee
D.wake manatees up from their torpor state

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B
The Couch Surfing network is an online community stretching across the globe with over one and a half million members.The basic concept is to provide a platform for travelers to contact people who are willing to put them up free of charge.Travelers connect with potential hosts online and, if they like each other, exchange details to make further arrangements.
Basil is one traveler from Switzerland who is currently couch surfing with a Chinese host in Beijmg."I thought staying in hostel is nice but you mostly meet foreigners and speak English.If you use Couch Surfing you have chance to meet people living here and really get a chance to know the life of the place you visit." Basil was speaking during a regular meeting of the Beijing network of Couch Surfing with a membership of almost 2,000.
Although some people may have concerns about meeting complete strangers and giving them full access to your house, Beijing group member Fred Sharp from California says that the Couch Surfing community is one that generally attracts trustworthy people.
"I have never had a problem with guests。I'd say that this Couch Surfing community worldwide is a fairly trustworthy community Like I say, always be cautious, make sure that you read everyone's profile that you're considering hosting, and if it doesn't feel right just say 'no', it's ok."
Originally launched in the US as a non-profit organization in 2004, Couch Surfing is growing fast across the world.China is no exception with around 30,000 members and hundreds more signing up each week.One of them is Beijing resident Hai Yan who joined in November 2009.She says the first time she hosted a guest was a very positive experience."My first guest was from Italy He was very kind and helpful.He bought me a present from Italy, a handbag.It's a famous brand!"
As the organization grows from strength to strength, hotel owners across the world will be watching very closely and possibly thinking twice about raising their prices too high.
61.The Couch Surfing network is intended to ____.
A.give reliable information about hotels
B.provide people with a platform to contact each other
C.find potential hosts who want to supply travelers with couches
D.offer travelers convenience to find suitable hosts for free accommodations
62.According to Fred Sharp, ____.
A.couch surfers can fully rely on Couch Surfing community
B.Couch Surfing community enables you to meet different people
C.Couch Surfing community is trusted by all couch surfers
D.couch surfers may form a judgment on hosts and make a final decision
63.We can infer from the passage that ____.
A.Couch Surfing has a long history       
B.Hai Yan is satisfied with her host
C.Couch Surfing is getting popular in China       
D.Basil works at the Beijing Network
64.The last paragraph suggests that hotels will ____.
A.be replaced by the organization   B.probably not charge too much
C.not consider raising their prices      D.show no concern about the organization

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