单项选择题
The phrase "radiation so strong it cracks glass" (line 4, paragraph 2) means______.
A.glass is too strong to be destroyed
B.radiation can cause glass to be broken
C.radiation is not strong enough to break glass
D.bacterium can break glass easily
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单项选择题
Which of the following is not true
A.Nuclear weapons were invented in the 20th century.
B.The Soviet Union created a biological weapon resistant to drugs.
C.DNA and the genetic code will be used to create weapons.
D.Scientists have found a type of indestructible bacterium.
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单项选择题
The main idea of the first paragraph is______.
A.The advantages in using bio-weapon
B.The trend of nuclear weapon development
C.A variety of weapons invented by man
D.The history of nuclear weapon development
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