难降解的有毒物质沿食物链“浮游植物→浮游动物→鱼→猫”传递时,体内该有毒物质浓度最高的生物是 ( )
A.浮游植物
B.浮游动物
C.鱼
D.猫
参考答案:D
感染性眼内炎,最常见的病因是()。
A.内眼手术后
B.身体其他部位的微生物扩散到眼内
C.角膜异物取出后
D.蚕蚀性角膜溃疡
E.外伤性感染性眼内炎
—What do you think of the film So Young directed by Zhao Wei?
—Wonderful. I think it’s _____than the other films about youth in recent years.
A.the best
B.the worst
C.much better
D.much worse