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one sixth one ninth one twentieth five sixths two ninths seven twentieths attention 61659192201207one (a) half a quarter three quarters three and a half 213414321back past now so far So far , I have read five English masterpieces(名著) . back 。 billion≈1 / 5 (one 20 percent (20%) One fifth of the people in the world live in China. fifth) 01234567the populationthe worldChinamore What problems does a large population cause? ?Because of the large population, there is______ (more\ less) living space. ?Because of the large population, it’s ______ (difficult\ easy) for many people to find jobs. ?Because of the large population, we are short of ____