单项选择题 He hasn‘t analyzed why he tips so generously, but I think the proclivity stems from his high school years, when he worked as a busboy.（）

单项选择题There were still a few surprises, as a squeal here and there in the dark announced, but we did learn to ―see with our feet‖ – lessons in trail Braille.（）

A.divergence
B.scream
C.gradation
D.strand

单项选择题Browse one of the websites that hosts them, like YouTube or Google Vides, and you‘ll see drunken karaoke, babies being born, plane crashes,freakish sports accidents and far, far stranger things.（）

A.elegant
B.fraternal
C.frantic
D.bizarre