B.What the relationship between the black hole and other stars is.

　　C.How the black hole and the bulge affect each other's growth.

　　D.When and how the earliest stars and galaxies began to form.

　　解析：细节理解题。根据末段“The next challenge is to work out how the black hole

　　and the bulge affect each other's growth...”可知，答案为C。答案：C

　　5.What can we conclude from this passage？

　　A.The universe has a history of about one billion years.

　　B.Scientists know little about how the universe was formed.

　　C.Research on black holes has been carried out for decades.

　　D.Scientists have found some valuable

　　evidence by analyzing radio waves.

　　解析：推理判断题。根据第五段“New radio telescope observations...may have answered that question.”可知，答案为D。

　　答案：D

　　.信息匹配

　　阅读下列应用文及相关信息，并按照要求匹配信息。

　　以下是英语电影的名称及内容简介：

　　A.Birth of a Nation

　　Birth of a Nation was the most popular film or the silent era.The message in the film was that African Americans could never be integrated into the white society as equals.Race violence directed against African Americans took place in many cities.In the South，African Americans were only allowed to go to separate schools，hotels，and restaurants.

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