当猫处于黑暗处时,眼睛的变化( )
A:瞳孔放大
B:视网膜不可以成像
C:瞳孔缩小
D:光线不能通过角膜
After studying in a medical college for five years,Jane________her job as a doctor in the countryside.
读图,回答下列问题.
“高原绿了,农民富了”。说明黄土高原治理的根本是( )