42．According to the passage，which of the following is NOT true?

　　A．A black hole can be very tiny but extremely heavy.

　　B．The gravity of a black hole holds all light in its center.

　　C．Scientists observe high－energy light through their own eyes.

　　D．Some small black holes came into being as early as the universe.

　　答案　C　[推理判断题，根据文章的最后一段When a black hole and a star are close together, high－energy light is made. This kind of light cannot be seen with human eyes. Scientists use satellites and telescopes in space to see the high－energy light可知科学家们观察高能量的星星是通过望远镜和卫星观察的，不是用肉眼观察的，故选C。]

　　43．Which can be inferred from the passage?

　　A．Every galaxy must have a black hole.

　　B．A galaxy is the center of the universe.

　　C．A galaxy consists of a large group of stars and planets.

　　D．Earth's galaxy is called the Milky Way.

　　答案　C　[推理判断题。根据第五段的Scientists have found proof that every large galaxy contains a supermassive black hole at its center可知选C。]

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

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

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