42 The skywalk allows tourists to take in the breathtaking mountain view of the narrow deep valley down
which the torrents of the waterfall _______ .
(A)trickle
(B) tumb le
(C) cascade
(D) fi Iter
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cascade cascade中文意思是...
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（A）涓滴（B）翻滾（C）噴流（D）過濾...
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