细胞因子的共同特性（） A.化学性质大都为糖蛋白 B.化学性质大都为蛋白多糖 C.细
题型：多项选择题
问题：
细胞因子的共同特性（）
A.化学性质大都为糖蛋白
B.化学性质大都为蛋白多糖
C.细胞因子可以旁分泌、自分泌或内分泌
D.一种细胞可产生多种细胞因子
E.不同细胞可产生一种或几种相同的细胞因子
题型：多项选择题
Shishmaref, an Eskimo village on an island off northwestern Alaska, is falling into the ocean. Giant storm waves have so hit the place—once well buffered by sea ice—that villagers voted in 2002 to leave their ancestral home for the mainland. They are being called one of the first refugees（难民）of global warming. 
“We tend to describe climate change in terms that are abstract—a one degree rise in temperature, an increase in greenhouse gases—but when waves wash away a village, that’s concrete and very emotional,” says Igor Krupnik, an expert at the National Museum of Natural History. “When they lose a piece of their land, they aren’t just losing a certain number of square miles. They are losing part of their history and their memory. They are losing childhood events and grandparents’ tales.”
Before temperatures began to rise in Shishmaref about 30 years ago, 20 to 30 miles of hard sea ice protected the village from powerful fall storms. But the natives say the ice doesn’t freeze as solidly or as soon as it used to and now stretches only six or seven miles, leaving the community of 600 people more exposed. Storms have swept houses into the ocean.
The villagers’ plan is to move to Tin Creek, a site on the Alaska mainland 12 miles away, and they have received $180 million from the government. Residents hope that in their new community they’ll be able to maintain their close ties, continue hunting animals, and keep fishing, much as their ancestors have done for centuries. “People are asking why the government should be spending so much money on so few people,” said a government official. “But people in Alaska are like everyone else. We want to help keep their culture alive.”
小题1:The underlined word “buffered” probably means “______”. 
A．protected
B．destroyed
C．prevented
D．damaged小题2:From the passage what do we know about the sea ice around the village in the past?
A．It was very thin and easily broken.
B．It was very thick and smooth.
C．It frozen more solidly and sooner.
D．It frozen more slowly and solidly.小题3:According to the passage, _____ caused the village to be in danger of disappearing.
A．water pollution
B．global warming
C．air pollution
D．human’s actions小题4:What’s the villagers’ main purpose to rebuild the community?
A．To live more happily
B．To earn money
C．To avoid being washed away
D．To keep their culture alive