题目

阅读理解     Black holes were first put forward by Albert Einstein in 1916. However, scientists had not proved their directly. That changed on April 10, 2019, with the release of the first photo of a black hole in the center of the galaxy (星系)M87, located 55 million light years from Earth.     The photo does not show the black hole itself. That's because they are black and so they can't be seen in space.the scientists used radio signals to capture (拍摄)the black hole's "shadow" —the bright ring that forms around its edge, when light bends because of the extreme gravity around the hole.     The M87 black hole, believed to have a mass 6.5 billion times that of our sun, was captured using the Event Horizon Telescope (EHT)—a network of eight powerful telescopes(望远镜.)The telescopes, located in Hawaii, Arizona , Chile, Mexico, Spain and Antarctica, separately captured the black holl's radio signals over four nights in April 2017, when the weather was fine in all six places. The data was transpcried to a centre where it was dealt with by a supercomputer to form the photo of the black hole's shadow. The researchers say while the photo is slightly blurry, future photos will be clearer as more telescopes are added to the EHT. Black ' holes are not easy to capture on camera because  they are surrounded by thick dusty and hot gases.     Black holes are areas in space where the pulling strength of gravity is so powerful that even light is unable to escape. They can be different widely in size and mass. The smallest,  called "primordial" black holes are as small as a single atom but with a mass of a big mountain. " Stellar'' black holes, which are the most common, have a diameter (直径)of about 10 miles and a mass 20 times that of our sun. The largest or "supermassive'' black holes, similar to that of M87's, can have a mass . greater than millions, or even billions of suns combined. （1） What can we infer from the first paragraph? A . Einstein's predicticn about black holes is right. B . Einstein captured the black hole a century ago. C . Scientists haven't proved black holes' presence. D . The black hole has been known for centuries. （2） What did the scientists use to capture the black hole's "shadow"? A . Moon light. B . Natural light. C . Radio signals. D . Sound waves. （3） What does the underlined word "blurry" in the third paragraph probably mean? A . Not big. B . Not clear. C . Not new. D . Not attractive. （4） What can we know about the M87 black hole? A . It is almost empty. B . It is the smallest one. C . It is very bright. D . It is very large. 答案： A C B D

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