Question
8 to 20 are based on this passage
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Question 8
According to the passage, the author implies that foreign ecosystems have which potential effect on shorebirds?
A. They can make a bird more vulnerable to predators.
B. They can expose shorebirds to foreign toxins.
C. They can diminish a bird’s ability to navigate.
D. They can lead to a reduction in the bird’s weight.
E. They can cause a bird to become separated from its flock.
我的答案： 无