What is the main topic of this passage? What does "CBW’ represent?

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问题 What is the main topic of this passage?
What does "CBW’ represent?

选项 A、Casualties Blood War.
B、Conventional Blood War.
C、Coneern Bomb Weapon.
D、Chemical and Biological Weapons.

答案D

解析

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公共英语五级笔试

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