问题补充：
Soon, his warm, inviting smile put me, and spent the next two hours talking casually.
A. at attention
B. at ease
C. at best
D. at a loss
答案：
A. at attention
(答案→)B. at ease
C. at best
D. at a loss
解析：短语辨析。A.立正 B. 舒适 C. 最多 D. 困惑不解。句意：很快他灿烂热情的微笑让我感到舒适起来，在接下来的两个小时里随意的聊着，故选B。
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