A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole. Scientists can study stars to find out if they are flying around, or orbiting a black hole.

　　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.

　　【语篇解读】 本文主要讲述太空黑洞的形成原因和科学家们如何了解黑洞现象的。

　　1．The gravity of a black hole may become so strong that light cannot get out when________．

　　A．the star is going to die

　　B．special tools are used on it

　　C．other stars come close to it

　　D．it is seen from the space telescopes

　　答案　A　

　　2．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　

　　3．Which can be inferred from the passage?

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