9下表反映了英国农业人口的变化,导致这一变化的主要原因是<table style="PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; BORDER-COLLAPSE: collapse; PADDING-TOP: 0pt; mso-table-layout-alt: fixed" align="center"><tbody><tr><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: rgb(0,0,0) 0.5pt solid; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 145.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: rgb(0,0,0) 0.5pt solid; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="194">年份</td><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 40.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: rgb(0,0,0) 0.5pt solid; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="54">1840</td><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 40.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: rgb(0,0,0) 0.5pt solid; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="54">1870</td><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 40.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: rgb(0,0,0) 0.5pt solid; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="54">1900</td><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 40.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: rgb(0,0,0) 0.5pt solid; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="54">1920</td></tr><tr><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: rgb(0,0,0) 0.5pt solid; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 145.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="194">农业人口占总人口的百分比</td><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 40.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="54">22</td><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 40.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="54">14.8</td><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 40.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="54">8.4</td><td style="BORDER-BOTTOM: rgb(0,0,0) 0.5pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0pt; PADDING-LEFT: 5.4pt; WIDTH: 40.8pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; BORDER-RIGHT: rgb(0,0,0) 0.5pt solid; PADDING-TOP: 0pt; mso-border-left-alt: none; mso-border-right-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-top-alt: 0.5000pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.5000pt solid rgb(0, 0, 0)" valign="top" width="54">7.1</td></tr></tbody></table>
A.海外殖民战争
B.工业化及城市化
C.资产阶级革命
D.第一次世界大战
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