(单选题)17: 下列函数在区间（-∞，+∞）上单调递增的是(? ).
A: cosx
B: <img src="/NEWEXAMSYSTEM/UploadFiles/PiLiangDaoRuShiTi/3372/391006/17101716181441_images\17101716181441_img89.png" width="36" height="29" alt="" />
C: <img src="/NEWEXAMSYSTEM/UploadFiles/PiLiangDaoRuShiTi/3372/391006/17101716181441_images\17101716181441_img90.png" width="59" height="32" alt="" />
D: 8-x
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