摘要：Which of the following would follow the last paragraph? A. The environment for hibernating animals B.The recent discovery about hibernation C.The process of hibernating D. The recent discovery of space travel B Iceland has energy to spare,and the small country has found a cutting-edgeway to reduce its oil dependcy. Volcanoes formed the island nation out of ash and lava,which heat huge underground lakes to the boiling point. The hot water is piped into cities providing heat for homes ,businesses and even swimming pools . The water runs through turbines, providing all the country’s electricity. Iceland wants t6o make plans to improve its cars ,buses and trucks to run on renewable energy. Iceland has already started by turning water into fuel --- hydrogen fuel. Here’s how it works :Electrodeschange the water into hydrogen and oxygen molecules. Hydrogen electrons pass through a conductor that creates the current to power an electric engine. Hydrogen fuel now costs two to three times as much as gasoline, but gets up to three times the distance than gas, making the overall cost about the same . As an added benefit , there is no carbon ----only water steam. In the capital, Reykjavik, they are already testing three hydrogen-powered electric buses. The drivers are impressed. “I like these buses better because with hydrogen you get no pollution, said bus driver Rognvaldur Jonatanison . By the middle of this century , all Icelanders will be required to run their cars only on hydrogen fuel, meaning no more gasoline. “ If we make hydrogen and use that as a fuel for transportation then we can run the whole society on our own local renewable energy sources, said Marie Maack. Icelanders are showing the world that by making fuel from water,it is possible to kick the oil habit.
For some scientists, every day is Groundhog Day．But these researchers aren’t looking for a shadow．They’re trying to figure out how groundhogs each year put themselves into a state of nearly being dead．Body temperature quickly goes down, metabolism(新陈代谢)nearly shuts down, and heart rate slows to something nearly dead．Something changes these normally warm-blooded animals into cool balls．
But what? The answers could have deep implications(暗示)for umans．Explaining the mystery of hibernation(冬眠)is necessary for the attractive deep-space travel．If future generations are to stand an interplanetary journey(星际旅行), researchers must learn how to use animal-like hibernation．More immediately ,scientists believe the secrets of hibernation could drive great advances in stroke(中风)treatment, injury survival and even weight control．
“Why is it that this animal can eat like persons who are fat for several months and then shut off for a number of months?” asked Gregory Florant．He studies groundhogs, trying to understand how their energy regulation can change so greatly．
Contrary to popular ideas, hibernating animals don’t sleep for the winter and wake up in the spring．Hibernation is not sleep．An animal will periodically wake and then go back down into a state known as torpor(蛰伏)．The particular mark of hibernation is a great rise and fall in metabolism-wild swings(突然转变)in body temperature and blood flow that a person could not stand．
Since so many different mammals can hibernate, scientists believe the ability for human to survive similar changes of metabolism is probably buried in the genetic code, which remains a mystery．“We are mammals, therefore we share genes with other mammals that can do this,” Dr．Florant said．“We haven’t discovered what genes are directly involved．”
But researchers have recently gained some important breakthroughs about the process．
(1)
According to the passage,“groundhogs”should be ________．
[ ]
A．
a kind of bird
B．
cold-blooded animals
C．
animals able to hibernate
D．
a kind of snake
(2)
According to the passage ,when groundhogs are hibernating, they ________．
[ ]
A．
will experience great energy regulation changes
B．
can still fly freely together
C．
must change some genes in their bodies
D．
will completely shut down their metabolism
(3)
Finding out the secrets of hibernation is important for interplanetary journey because travelers probably ________．
[ ]
A．
can change their body temperature
B．
can control their blood flow
C．
can stand temperature changes in space
D．
don’t need to carry much food
(4)
Which of the following would follow the last paragraph?