单项选择题

The result of the increasing costs in natural disasters is

A．great loss suffered by commercial companies.
B．government's increased attention on disasters.
C．individual awareness to natural disasters.
D．more funds to support the prediction research.

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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.

单项选择题

When the author reflects on the linked interdependence of attack and defense, he suggests that

A．their origin preceded life.
B．their development is precipitated by one another.
C．their existence is dependent on human aggression.
D．their escalation cannot be halted.