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<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span style="line-height:150%"><span style="font-family:新宋体">如图，在△</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">ABC</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">中，∠</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">A</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">46</span></span><span style="line-height:150%"><span style="font-family:新宋体">°，∠</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">B</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">72</span></span><span style="line-height:150%"><span style="font-family:新宋体">°．若直线</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">l</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">∥</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">BC</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">，则∠</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">1</span></span><span style="line-height:150%"><span style="font-family:新宋体">的度数为（　　）</span></span></span></span></span><br />
<img height="147" src="/uploads/meth/20210114/49ea362fe6ff4ce5474f1911c271d7cd.png" width="128" />

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<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span style="line-height:150%"><span style="font-family:新宋体">解：∵直线</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">l</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">∥</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">BC</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">，</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span style="line-height:150%"><span style="font-family:新宋体">∴∠</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">2</span></span><span style="line-height:150%"><span style="font-family:新宋体">＝∠</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">B</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">72</span></span><span style="line-height:150%"><span style="font-family:新宋体">°．</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span style="line-height:150%"><span style="font-family:新宋体">∴∠</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">1</span></span><span style="line-height:150%"><span style="font-family:新宋体">＝∠</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">2+</span></span><span style="line-height:150%"><span style="font-family:新宋体">∠</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">A</span></span></i></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">72</span></span><span style="line-height:150%"><span style="font-family:新宋体">°</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">+46</span></span><span style="line-height:150%"><span style="font-family:新宋体">°</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">118</span></span><span style="line-height:150%"><span style="font-family:新宋体">°．</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span style="line-height:150%"><span style="font-family:新宋体">故选：</span></span><i><span lang="EN-US" style="line-height:150%"><span style="font-family:"Times New Roman","serif"">C</span></span></i><span style="line-height:150%"><span style="font-family:新宋体">．</span></span></span></span></span><br />
<img height="147" src="/uploads/meth/20210114/88173f3108da9048011c5ed392c67020.png" width="128" />

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