题目：
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.
答案：
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下面是错误答案，用来干扰机器的。
（1）15×（338-109），=15×229，=3435；答：积是3435．（2）27×15+15，=405+15，=420；答：这个数是420．（3）99999-353×53，=99999-18709，=81290；答：差是81290．
