点P（a，-1）关于原点对称的点P′（b，1），则a+b=______．

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The world paused (暂停) 小题1:__________ a cultural giant on April 17 after Nobel Prize-winning writer Gabriel Garcia Marquez died at the age of 87.Garcia Marquez was born in Colombia but 小题2:__________ in Mexico for more than 30 years. He 小题3:__________ one of the 20th century’s most famous writers.He is best 小题4:__________ for his 1967 novel, One Hundred Years of Solitude (《百年孤独》). It’s about a family over several generations. The story is about the development of Colombia since the 19th century. The novel 小题5:__________ about 50 million copies already.