<span style="font-family:宋体;mso-ascii-font-family:calibri;mso-hansi-font-family:calibri">在北方,人们常用地窖来储存粮食和蔬菜,人们在进入地窖之前,要将地窖的通风口打开一段时间,这么做,最主要是因为</span><span lang="en-us">( )</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-hansi-font-family:calibri">。</span>

<span lang="en-us">A</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-hansi-font-family:calibri">.地窖内太冷了</span><span lang="en-us">B</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-hansi-font-family:calibri">.地窖里有大量的二氧化氮</span> <span lang="en-us">C</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-hansi-font-family:calibri">.地窖里有大量的二氧化碳</span><span lang="en-us">D</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-hansi-font-family:calibri">.地窖里有大量的氧气</span>

时间:2023-10-09 09:01:16

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