单项选择题

According to the passage, human competition to develop the best weapons

A．began in the 20th century.
B．escalated in the 20th century.
C．is a modern phenomenon.
D．is genetically predetermined.
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单项选择题
Gradually March seems to be in a state of
A．blankness.
B．imagination.
C．sadness.
D．excitement.
单项选择题
The passage creates an overall impression of
A．mystery.
B．horror.
C．liveliness.
D．contempt.
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