单项选择题

We can conclude from the last paragraph that______.

A．scientists will lose the war against diseases
B．scientists will generally win the war over the bacterium
C．scientists will be defeated in the war over the bacterium
D．scientists will win the war over the bacterium completely
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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
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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