原题
录音 1
What does the speaker warn may cause imbalances in food webs?
AA decrease in the population of migrating birds
BSlight changes in the migratory paths of birds
CIncreases in the distances traveled by migrating birds
DDecreases in the population of pests along migratory paths
正确答案：A
解题思路
老师暂未填写解题思路。