A. Their large body size
B. Their poor vision
C. Their inability to echolocate
D. The rate of water flow in their habitat
E. The level of visibility in their habitat
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答案：BCE
题型：细节题
音频定位：
定位点1: The manatee's habitat is often characterized by dark, murky water.
定位点2: Manatees don't have very good vision anyway.
定位点3: And unlike other marine mammals, such as whales and dolphins, manatees don't use echolocation.
解析：B选项对应定位点2。C选项对应定位点3。E选项对应定位点1。
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