(单选题)3: 设,则f(x)=(? ).
A: <img src="/NEWEXAMSYSTEM/UploadFiles/PiLiangDaoRuShiTi/3372/391006/17101716181441_images\17101716181441_img13.png" width="51" height="28" alt="" />
B: <img src="/NEWEXAMSYSTEM/UploadFiles/PiLiangDaoRuShiTi/3372/391006/17101716181441_images\17101716181441_img14.png" width="54" height="30" alt="" />
C: <img src="/NEWEXAMSYSTEM/UploadFiles/PiLiangDaoRuShiTi/3372/391006/17101716181441_images\17101716181441_img15.png" width="51" height="30" alt="" />
D: <img src="/NEWEXAMSYSTEM/UploadFiles/PiLiangDaoRuShiTi/3372/391006/17101716181441_images\17101716181441_img16.png" width="51" height="29" alt="" />
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