According to the passage, scientists failed to______ A: discover the characteristic of nuclear process B: discover the nature of uranium ore C: save the life of uranium miners D: store nuclear wastes in underwater tanks

They have been arrested as suspected drug______. A: abortion B: vector C: uranium D: traffickers

The melting point of uranium dioxide is plutonium dioxide A: higher than that of B: the same as C: lower than that of D: similar to

Her studies showed that the effects of the rays were constant even when the uranium ore was treated in different ways. (Para. 5)

Iran is found to be （） A: producing nuclear weapons B: creating fuel for nuclear reactors C: setting up about 100 centrifuges D: enriching uranium

According to the passage, if there were 500 tons of uranium ore, how many tons of useful uranium-235 could be extracted A: 1 kilogram. B: 10 kilogram. C: 50 kilogram. D: 500 kilogram.

Which one is the proper writing of the keywords:______ A: Keywords: English, vocabulary, tendency B: keywords: Collocation Context Connotation C: keywords: mass media D: keywords: nuclear waste, nuclear fuel cycle, remediation, bioremediation, citrobacter, heavy metal accumulation, uranium transuranic elements, technetium, tributyl phosphate