人民币兑外币的汇率发生了以下变化（人民币/1单位外币），体现出（       ）<table style="border: currentColor; margin-left: -0.6pt; border-collapse: collapse; mso-border-left-alt: 0.5000pt solid windowtext; mso-border-top-alt: 0.5000pt solid windowtext; mso-border-right-alt: 0.5000pt solid windowtext; mso-border-bottom-alt: 0.5000pt solid windowtext; mso-border-insideh: 0.5000pt solid windowtext; mso-border-insidev: 0.5000pt solid windowtext; mso-padding-alt: 6.0000pt 6.0000pt 6.0000pt 6.0000pt;" border="1" cellspacing="0" _dj="MsoNormalTable"><tbody><tr><td style="padding: 3.75pt 6pt; border: 1pt solid rgb(0, 0, 0); mso-border-left-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-top-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-right-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.7500pt solid rgb(0, 0, 0);" valign="center">时间</td><td style="border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) rgb(0, 0, 0) currentColor; padding: 3.75pt 6pt; mso-border-left-alt: none; mso-border-top-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-right-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.7500pt solid rgb(0, 0, 0);" valign="center">美元</td><td style="border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: rgb(0, 0, 0) rgb(0, 0, 0) rgb(0, 0, 0) currentColor; padding: 3.75pt 6pt; mso-border-left-alt: none; mso-border-top-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-right-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.7500pt solid rgb(0, 0, 0);" valign="center">人民币</td></tr><tr><td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor rgb(0, 0, 0) rgb(0, 0, 0); padding: 3.75pt 6pt; mso-border-left-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-top-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-right-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.7500pt solid rgb(0, 0, 0);" valign="center">2018年11月1日</td><td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor rgb(0, 0, 0) rgb(0, 0, 0) currentColor; padding: 3.75pt 6pt; mso-border-left-alt: none; mso-border-top-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-right-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.7500pt solid rgb(0, 0, 0);" valign="center">1</td><td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor rgb(0, 0, 0) rgb(0, 0, 0) currentColor; padding: 3.75pt 6pt; mso-border-left-alt: none; mso-border-top-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-right-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.7500pt solid rgb(0, 0, 0);" valign="center">6.93</td></tr><tr><td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor rgb(0, 0, 0) rgb(0, 0, 0); padding: 3.75pt 6pt; mso-border-left-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-top-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-right-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.7500pt solid rgb(0, 0, 0);" valign="center">2019年11月18日</td><td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor rgb(0, 0, 0) rgb(0, 0, 0) currentColor; padding: 3.75pt 6pt; mso-border-left-alt: none; mso-border-top-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-right-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.7500pt solid rgb(0, 0, 0);" valign="center">1</td><td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor rgb(0, 0, 0) rgb(0, 0, 0) currentColor; padding: 3.75pt 6pt; mso-border-left-alt: none; mso-border-top-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-right-alt: 0.7500pt solid rgb(0, 0, 0); mso-border-bottom-alt: 0.7500pt solid rgb(0, 0, 0);" valign="center">7.02</td></tr></tbody></table>①人民币升值②人民币贬值③有利于去美国旅游、留学④有利于中国的商品出口到美国