Bats (are able) to (guide them) by producing sound waves (too high) for us (to h

游客2025-03-14 30

问题 Bats (are able) to (guide them) by producing sound waves (too high) for us (to hear).

选项 A、are able
B、guide them
C、too high
D、to hear

答案 B

解析

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