They are going to go on a world tour _____ they will perform in ten different cities.[ ]

A. which

B. in which

C. in where

D. that

如图为正常眼和不正常眼的眼球成像示意图，请据图完成下列问题．

（1）图B所示的是这种眼球看______时的成像状况．可以配戴______加以矫正．

（2）图中D所示的是眼球的______结构，它的功能是对反射进眼球的光线起______作用．当你注视由远处飞来的足球时，它的变化是______．