问题详情

Snowblindnessmaybeavoidedby______.
A．concentratingtothesolidwhiteterrain
B．searchingforsomethingtolookatinsnow-coveredterrain
C．providingtheeyeswithsomethingtofocuson
D．coveringtheeyeballswithfluid
请帮忙给出正确答案和分析，谢谢！