[单项选择]　　By the time we had completed our preparations, the sky was beginning to grow rapidly lighter, although the sun was not yet above the horizon. We waited unpatiently, hardly daring to move or to whisper to one another. Suddenly, we heard the quick beating of wings and one of the birds we were looking for flew up from the valley beyond. He flied straight to the tree and settled on a thin branch, stripped bare of leaves, which grew diagonally upwards from the main trunk. Immediately he began to clean himself, combing with his beak the long soft feathers which grew from beneath his wings and extended past his tail in a glorious red cloud. Charles’’s camera, on a trial run, sounded unexcepted loud, but the bird took no notice and continued with his cleaning until at last he drew himself up and shook himself. Then, head held high, he called a single, loud, sharp note which resounded over the valley. He seemed in no hurry to begin his dance, as he continued to call for a quarter of an hour.
A. he showed off his tail feathers
B. he shook leaves off the tree
C. he threw away some feathers
D. he cried more frequently

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