Researchers have discovered that dolphins are able to mimic human speech.

单项选择题This reflects the priority being attached to economic over political activity, partly caused by a growing reluctance to enter a calling blighted by relentless publicity that all too often ends in destroying careers and reputations.

单项选择题Tiny Tim, a character in A Christmas Carol, was a happy little boy in spite of the disability that caused him a weakness in one leg .