In the course of（ ）, some birds have lost the power of flight.

In the course of（ ）, some birds have lost the power of flight.
A、exhibition
B、evolution
C、equipment
D、environment
【正确答案】：B
【题目解析】：本题考查名词词义辨析。exhibition：展览；evolution：进化，演变；equipment：设备，器材；environment：环境。句意：在进化的过程中，一些鸟丧失了飞行能力。故B选项符合题意。