中国石油大学 / 中石油
正确率:100%
23.(2.0分) Bats find their way by squeaking ______ and guiding themselves by echoes.
A、very fast
B、very fastly
C、much faster
D、most fastly
A、very fast
B、very fastly
C、much faster
D、most fastly
参考答案:
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