Questions 51 to 54 based on the following passage:
Radioactive materials in wide use in the United States
could be turned into weapons terror that would probably
kill few people but would spread panic and produce severe
economic damage, scientists told the Senate Foreign
Relations Committee today.
The materials would not produce nuclear explosions.
Rather, they would be spread using conventional explosives
in so-called dirty bombs. The scientists who testified at
the committee’s hearing today said such weapons were a
potentially serious problem. The most dangerous materials,
they said, are bars of radioactive cobalt (钴) used to
irradiate（辐射） food, medical devices and other products
to sterilize (消毒) them. If turned into fine particles and
dispersed under the right weather conditions, the cobalt
could spread enough radiation to force the abandonment of
an area the size of Manhattan, the scientists said. But
federal and industry officials said such an action with
radioactive cobalt was unlikely because of the intense
radiation to which the person trying to use the weapon
would be exposed and because the material is transported in
secret and kept behind tons of lead and other shielding
while on the road or in use.
Other radioactive materials in tens of thousands of medical
and industrial devices could be used to make weapons that
would leave wide areas with radiation level above
Environmental Protection Agency limits, possibly leading to
temporary evacuation and extremely difficult cleanup.
Scientists at the hearing held to understand these threats
and to device ways of protecting Americans against them
also said that they remained concerned that fissionable(裂
变)material- the fuel for nuclear weapons-and the expertise
needed to use it could be spreading from the former Soviet
Union to terrorist networks, but presented no new evidence
of such leakage.
Dr. Richard Meserve, chairman of the Nuclear Regulatory
Commission, said that all such materials, as well as the
much more powerful cobalt rods used in sterilizing food,
are tightly controlled. He said that the weaker sources, if
dispersed, would cause almost immeasurably small increases
in cancer rates among people who were exposed.
Nevertheless, that sort of attack could cause long-term
problems because technique for dealing with radioactive
contamination rely largely on destruction and removal, Dr.
Henry Kelly, president of the Federation of American
Scientist, said. Because limits set by the Environmental
Protection Agency for radiation exposure are so low, areas
might have to be evacuated for the long term even when the
health risks are relatively slight, he said.
51. Which of the following can be the main idea of the
passage?
A. American should keep an eye on radioactive
materials that are likely be used for nuclear bombs.
B. America should keep an eye on cobalt bars that
are likely to be used for nuclear bombs.
C. America should keep an eye on radioactive
materials that are likely to be used for terrorism actions.
D. America should keep an eye on cobalt bars that
are likely to be used for terrorism actions.
52. Which of the words below can replace the word “fine”
(line 6, Para 2)?
A. Unnoticeable
B. Small
C. Good
D. Gaseous
53. Federal and industry officials are concerned with all
of the following BUT _____
A. Cobalt bars that can be used by terrorists to
launch terror actions against America.
B. Terrorist who may use cobalt bars to make nuclear
weapons for terror actions against America.
C. Radioactive materials in medical and industrial
devices that could be used to make weapons.
D. Terrorists who may get knowledge from other
countries to make nuclear weapons for terror actions.
54.as to the radiation exposure limits set by the
Environmental Protection Agency, Dr. Henry Kelly may think
that____
A. It’s necessary for the security of America
B. It’s too high so that it cannot function well.
C. It’s too low so that it can cause some
unnecessary costs and panic.
D. It’s a good limits system that function well for
anti-terrorism movement.
摘自《英语－－临考点拨与模拟考场》
策划：太奇MBA培训中心
主编：周建武
出版社：中国经济出版社
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