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

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

admin2012-10-27  63
问题 Bats (are able) (to guide them) by producing sound waves (too high) for us (to hear).
选项 A、are able
B、to guide them
C、too high
D、to hear
答案B
解析 应改为to guide themselves。
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成人本科学位英语

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