眼痛与下列哪种因素有关（）
A.眼部炎症
B.眼部外伤
C.各种青光眼
D.视疲劳
E.以上都是
参考答案：E
若函数f（x）=x3-ax2+2的一个极值点是2，则a=______，此函数在区间[-1，1]上的最大值是______．
According to the statement, Cheliean sea bass, a species of fish available along the coasts of the South Pole, might have already become extinct due to illegal hunting.
