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 passage is mainly about______.

A．nuclear weapons
B．biological weapons
C．chemical weapons
D．bio-chemical weapons

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