Is this lecture speaking of something actually taking place, or of something being recalled and thought about

单项选择题According to the author, which of the following statements is true

单项选择题What had been taking place during the time of the Roses

单项选择题On what country is this selection based

单项选择题It can be inferred from the passage that European art trends probably affected United States art most during ______.

单项选择题Why does the author mention Alfred Stieglitz