单选题According to the passage, frogs are vulnerable in backyards because they are ______.Aharmed by the toxins used to eliminate insect lifeBexposed to moving logs that disrupt their feedingCendangered by the predators of slugs and snailsDthreatened by careless motorists ignorant of frog migration patternsEdenied dark places to produce defense mechanisms
单选题
According to the passage, frogs are vulnerable in backyards because they are ______.
A
harmed by the toxins used to eliminate insect life
B
exposed to moving logs that disrupt their feeding
C
endangered by the predators of slugs and snails
D
threatened by careless motorists ignorant of frog migration patterns
E
denied dark places to produce defense mechanisms
参考解析
解析：
文中提到人们在后院里放置毒素以消灭昆虫的做法，故选A项。
文中提到人们在后院里放置毒素以消灭昆虫的做法，故选A项。
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