Whichone<br/>of thefollowingstructures<br/>is a part of the fibrous tunica of the eyeball? () A: the iris B: the ciliary body C: the choroid D: the retina E: the cornea

眼球壁的中层又称葡萄膜()、血管膜、色素膜,主要包括() A: 虹膜(iris) B: 睫状体(ciliary<br/>body) C: 脉络膜(choroid) D: 巩膜(sclera)