What do astronomers use photographic plate for?

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问题 What do astronomers use photographic plate for?

选项 A、Decreasing the time it takes to photograph objects.
B、Avoiding using a telescope.
C、Sharpening the color of what they observe.
D、Obtaining images of distant objects.

答案D

解析 细节归纳题。文中说照相平盘可以记录下由望远镜捕捉到的物体,然后把其拍成照片,故D项意思正确。
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