2. 外语
  3. When hummingbirds fly, their wing beats are so rapid that the wings seem blurred.

When hummingbirds fly, their wing beats are so rapid that the wings seem blurred.

admin2012-07-29  23
问题 When hummingbirds fly, their wing beats are so rapid that the wings seem blurred.
选项 A、tiny
B、fragile
C、indistinct
D、inexhaustible
答案C
解析 使模糊
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