题目内容
（请给出正确答案）
A. their sizes
B. the usual pattern of their migrations
C. their environments
D. their habits
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更多“By listening to the sounds fis…”相关的问题
A.Blocking，learing，listening，forwarding
B.Blocking，learing，forwarding，listening
C.Blocking，listening，learing，forwarding
D.Blocking，forwarding，listening，learing
A.is listening to a CD
B.is listening a CD
C.listening a CD
D.is listening CD
A.learning
B.scanning
C.listening to
D.understanding
He______that his guests were bored, although they were listening politely.
A．impressed
B．sensed
C．inferred
D．identified
