单项选择题

A．The influence of weather on Alfred Stieglitz’ photography.
B．Alfred Stieglitz’ approach to photography.
C．Photographic techniques common in the early 1900’s.
D．The life of Alfred Stieglitz.
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单项选择题
A．It has broken down before.B．She generally doesn’t allow people to borrow it.C．She is trying to sell it.D．She bought it from a friend.
A．It has broken down before.
B．She generally doesn’t allow people to borrow it.
C．She is trying to sell it.
D．She bought it from a friend.
填空题
The Sabin vaccine was given most often on ______, but Koprowski’s vaccine was squirted into people’s mouths.
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