下列关于自然现象的解释，正确的是（  ）

下列关于四种生物的叙述，其中正确的是（      ）

    Gabriel Garcia Márquez ,who was awared the Nobel Prize for Literature in 1982，passed away at the age of 86 on April 17，2014. The world paused to remember the cultural giant .
    Garcia Márquez was born in Colombia ,but he spent most of his adult life in Mexico City . As one of the most famous writers ,he was widely regarded as “a giant of 20th-century literature ” . Garcia Márquez wrote in a style  called “magical realism ”In such works,people live a daily life in a certain period of time in history . But meanwhile ,magical things happen to them .
    Garcia Márquez is best known for his 1967 novel ,One Hundred Years of Solitude ,which has sold about 50 million copies . It tells the tale of the small and isolated town of Macondo which was separated from the outside world –of its founding and its troubled history over a hundred years . The story is a metaphor for the development of Colombia since the 19century . As Colombian President Juan Manuel Santons said , Garcia Márquez wrote about “the very essence of the Latin American beings".

甲、乙两城市为了解决空气质量污染问题，对城市及其周边的环境污染进行了综合治理．在治理的过程中，环保部门每月初对两城市的空气质量进行监测，连续10个月的空气污染指数如图所示．其中，空气污染指数≤50时，空气质量为优；50＜空气污染指数≤100时，空气质量为良；100＜空气污染指数≤150时，空气质量为轻微污染．