单项选择题

This book ______me twenty dollars.（）

A.is cost
B.was cost
C.cost
D.have been cost

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单项选择题

What is the main theme of the passage?（）

A.The decline of fresco painting.
B.The predominance of oils over watercolor.
C.The rediscovery of watercolor in England.
D.The origins and development of watercolor.

未分类题

According to the passage, where did the first colors for painting come from?A.Animal skins. B.The ground.C.Trees and leaves. D.Caves.