听力题 NATO troops are to join their former Cold War enemies in training exercises in Poland this week. The drills which will begin on 17th are the first major joint exercises of Western and Eastern armies under NATO''s partnership. Some nine hundred soldiers from thirteen countries will take part. NATO says it will be a good way to share peace-keeping experiences and develop a common understanding of operational procedures.

单选题 NATO troops will join in_________.

单选题 Soldiers from_________countries will participate.