单项选择题

The military operations()yesterday were targeted at the military installations.

A. propelled
B. commenced
C. plagued
D. modulated

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单项选择题

According to the passage, the Earth’s magnetic field has().

A. misguided many a man and animals
B. begun to change to it’s opposite direction
C. caused the changes on the polarities
D. been weakening it’s strength for a long time

单项选择题

Which of the following statement is NOT among the reasons that change the rules of psychological warfare().

A. Break the morale of their opponent.
B. Advances in technology.
C. The popularity of the Internet.
D. Prosperity of media.