听力原文：In this century, photographs have been really important for teaching art history.

听力原文： In this century, photographs have been really important for teaching art history. I will show what I mean in a moment with some photographs taken by Peter and Paul Julie. The work of these two photographers has been a very useful source for studying the art produced in the United States from 1896 to the present. Peter and Paul Julie were not artists, but they were a regular part of New York art scene. They took over a hundred thousand photographs which document the life and work of thousands of artists. Peter Julie is known as pioneer in this field of art photography. George Orkieve and other famous artists sought him out to take pictures of their work. His specialty was photographing painting. His son Paul photographs sculptures. Some of their most important photos are the ones of works of art that have since been destroyed. One example is a photo that we'll look at today. Would someone get the light please？ Thanks. This slide is from a photograph of painting by Edvord Harbor called Com Belt City. The painting was exhibited only two or three times before it was destroyed in the fire. Without the Julies photograph, no visual record of the work would exist. Although the Julies mostly photographed the works of painters and seulptors, they also occasionally photographed architectural subjects. They did quite a few photos of the buildings by John Muisopope. And we're going to look at one of those next.

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A．A painter and a sculptor.

B．Paintings inspired by photographs.

C．Early photographic techniques.

D．The work of two photographers.