已知定义在R上的奇函数f（x）和偶函数g（x）满足f（x）+g（x）=ax-a-x+2（a＞0且a≠1），若g（2）=a，则f（2）=（ ）。
在现实中用逆光观看物体时，其轮廓线最为（）。
A、朦胧
B、清晰
C、浑浊
D、整洁
Signs and symptoms of retinal detachment include which of the following
A. Painless decrease in vision, a veil over the visual field, and flashing lights.B. A veil over the visual field, increased intraocular pressure, and yellow-green halos around visual images.C. Photophobia, yellow-green halos around visual images, and blurred vision. D. Unilateral eye inflammation, a cloudy cornea, and a moderately dilated pupil.
