C
With a westerly wind at its back, the male bear continued to patrol the shore. Then, perhaps catching the scent(气味)  of something unusual, it stopped dead in its tracks. It sniffed the air, and steam came out of its bright black mouth. Following its nose, so sensitive that some say it can smell a rotting whale body from 20 miles away, the bear suddenly turned downwind and inland. Its paddle－like paws dragged, leaving deep tracks in the sand and closing in on its prey(猎物)．
It was to be the adventure of a lifetime. For almost two years, longtime friends Sebastian Plur Nilssen and Ludvig Fjeld, both 22, had been training for this two－month－long kayak(皮船) expedition. Hoping to follow in the footsteps of other Norwegian explorers such as Roald Amundsen and Thor Heyerdahl, the two were attempting to become the first kayakers to paddle around the entire Svalbard archipelago(群岛), a trip of more than 1，100 miles through one of the world's most remote regions.
To get fit, they had worn dry suits and kayaked through the ice－filled rivers near their hometowns outside Oslo, pulled heavy kayaks over ice floes(冰川), and jumped into the freezing waters to toughen themselves.
Lifelong hunters, they polished their shooting, by running up hills, loading their rifles, and pulling the triggers(扳机). As many Arctic experts had told them, if they needed to defend themselves from a polar bear, they'd have little time to think. Each carried a rifle in a waterproof bag tied to their kayaks. Holding steady, controlling their breathing, aiming, shooting: It all had to be second nature.
The two pioneers set out from Longyearbyen, also called the northernmost settlement in the world, on July 5，2012. They averaged about 15 miles a day, and by the end of July, they had reached the northern shore of Nordaustlandet, one of Svalbard's High Arctic islands.
With the wind picking up and the sea growing rough, they decided to head for shore and camp on a beach near a promontory named Ekstremhuken. As Nilssen paddled alongside Fjeld, he held up the map and joked, “Funny name for a place, no? I wonder if that means something ‘extreme’ will happen here？” Fjeld smiled.
After pulling their kayaks onto the rocky beach, they put up their tent and fitted a trip－wire boundary nine feet away, as they did at every campsite. A series of small explosive charges would go off if an animal were to cross the wire, giving the men time to grab their rifles and scare away a bear or, if necessary, shoot it.
The two awoke the next day to fierce winds and rough seas. After checking the weather forecast via satellite phone, Nilssen and Fjeld discussed the situation. “We'll have to stay another night，” Nilssen said. “Tomorrow should be clear.”

64. In order to carry out their expedition successfully, the two friends ________．
A. rushed uphill every day to practice their shooting skills
B. practiced survival skills in various arctic－like conditions
C. learned from other arctic experts to deal with polar bears
D. paddled their heavy kayaks over ice floes and icy rivers
65. By July 31，2012, the two explorers had covered about ________ on their expedition.
A. 1，100 miles   B. 900 miles  C. 550 miles  D. 400 miles
66.  The purpose of the writer's writing the first paragraph is to ________．
A. describe to the readers what the Arctic is actually like
B. impress the readers the freezing climate of the Arctic
C. imply the hidden danger two explorers would face ahead
D. describe what a sharp sense of smell a polar bear has
67. What can you predict logically happened to the two explorers the next day?
A. They had a hard time finding their way back home.
B. They shot the polar bear for food for their expedition.
C. The polar bear probably attacked them the second night.
D. They would set off and continued their expedition again.
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