单项选择题

Landsat 7 knows that Alaskan glaciers have shrunk because（）.

A．sightseers have noted the changes
B．computer-animated views have shown the shrinkage
C．one of the glaciers was hit by a ship
D．the temperatures are much colder

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单项选择题

57（）

A. Please wait here
B. Show
C. Here it is
D. your license
E. beg your pardon
F. May I see
G. I’m sorry
H. Be careful

填空题

A.there B.here C.where D.care