若圆的半径为3,圆心与点关于点对称,则圆的标准方程为 . 答案:The disaster at the Chernobyl(former USSR前苏联) power station happened quickly and
without warning. It was in the early hours of April 26, 1986 when the cooling
system of the reactor(反应堆) failed. Minutes later, a
violent (猛烈地) explosion blew the top off the reactor
and blasted(爆炸生成) a huge cloud of radioactive gas high
into atmosphere. Two people were killed immediately. Hundreds received powerful
radiation overdose (过量). And more than 25,000 had to be
taken away from their homes.
Days later, the radioactive cloud had spread
as far as Scotland. Its radiation was weak, but all over Europe radioactive
rain was falling. In some areas people were advised not to eat fresh
vegetables, or drink fresh milk, and the sale of meat was forbidden.
The accident at Chernobyl was the world’s
worst nuclear accident. In Britain, it convinced (使……相信) many
people that all nuclear power stations should be shut down for good. But the
Central Electricity Generating Board didn’t agree. They claimed that ·similar
disasters could not happen in Britain because of safer designs, fewer deaths
are caused using nuclear fuel (燃料) than by mining for
coal or drilling for oil and gas. Nuclear accidents are unusually fewer
compared with other types of accidents-such as air crashes, fires or dam
break-down more nuclear power stations are necessary because the world’s
supplies of oil, coal and natural gas are running out.
In 1957 in Cumbria (Britain) a nuclear reactor overheated and caught fire. No one was killed but fourteen workers
received radiation overdose. Small amounts of gas and dust were let out over
the local countryside.
An official report said the accident was
nearly a full-scale disaster. The Nuclear Authority wanted the report published
but the Prime Minister at the time refused. He thought that it would make
people less confident in Britain’s nuclear industry. Thirty years later, the
cabinet(内阁) records of
1957 were published. Only then did the public discover what had really happened
in Cumbria.
1.. One result of the Chernobyl nuclear disaster was
that ______.
A. 25,000 people were killed
B. fresh foods were polluted
C. people in Scotland were taken away from
their homes
D. hundreds of houses in Chernobyl were
destroyed
2..According to the passage, nuclear accidents______.
A. are most unlikely to cause death
B. are always kept secret from the public
C. can only happen in underdeveloped
countries D. may happen in any country that has nuclear power station.
3.. After the nuclear accident at Chernobyl many people
in Britain _______.
A. still believed it could not happen in
their country.
B. were not convinced that nuclear power
stations could be safe
C. accepted that there would be fewer deaths
than in drilling for oil
D. supported nuclear power stations because
world fuel supplies were low
4... The British Government refused to publish the
report on the Cumbria accident because _______.
A. Britain’s supplies of oil, coal and gas
were running out
B. it takes thirty years for the effects of
radiation to appear
C. fewer people died in that accident than in
other types of accidents
D. it was concerned that the British people
would doubt their country’s nuclear expertise (核技术)