答案　C　

　　4．What does the last sentence in Paragraph 5 suggest?

　　A．Neither the sun nor the earth is as heavy as a black hole.

　　B．There is only one supermassive black hole at the center of the Milky Way.

　　C．The supermassive black hole had existed before the Milky Way was formed.

　　D．There is a reason why the large black holes are called “supermassive”．

　　答案　D　

　　5．The last two paragraphs mainly focus on the question of________．

　　A．what a black hole is

　　B．how black holes form

　　C．how big black holes are

　　D．how scientists know about black holes

　　答案　D　

　　阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。

　　(2017·天津市十二区县联考二，C)

　　In modern society there is a great deal of argument about competition. Some value it highly, believing that it is responsible for social progress and prosperity. Others say that competition is bad; that it sets one person against another; that it leads to unfriendly relationship between people.

　　I have taught many children who held the belief that their selfworth relied on how well they performed at tennis and other skills. For them, playing well and winning are often lifeanddeath affairs. In their singleminded pursuit of success, the development of many other human qualities is sadly forgotten.

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