试题题干
划掉与段落内容无关的句子
Read the following paragraph and cross out TWO irrelevant sentences.
Black holes can be small or big. Scientists think the smallest black holes are as small as just one atom. When a black hole and a star are close together, high-energy light is made. These black holes are very tiny but have the mass of a large mountain. Another kind of black hole is called "stellar."(星系) Its mass can be up to 20 times more than the mass of the sun. The largest black holes are called “supermassive”, which have masses that are more than 1 million suns together. Black holes formed when the universe began. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The supermassive black hole at the center of the Galaxy is called Sagittarius A. It has a mass equal to about 4 million suns and would fit inside a very large ball that could hold a few million Earths.
参考答案
试题解析
本题考查对段落连贯性的理解与判断。
本段主要论述了黑洞的特点。
第一句——黑洞可大可小。
第二句——科学家认为最小的黑洞只有原子那么小。
第三句——当一个黑洞和一颗恒星很近时，会产生高能量的光。
第四句——这些黑洞很小但其质量却相当于一座山。
(第二句和第四句均不包含恒星的相关描述，且第四句和第二句均围绕“最小的黑洞”展开论述，因此第三句为无关句)
第五句——另一种黑洞被称为“星系”。
第六句——它的质量最高能达到太阳质量的20倍。
第七句——最大的黑洞被称为“超大质量黑洞”，质量超过一百多万个太阳。
第八句——黑洞是宇宙诞生时形成的。
第九句——科学家们已经找到证据证明每个大星系的中心都有一个超大质量的黑洞。
第十句——位于银河系中心超大质量黑洞被称为“人马座A”。
第十一句——它的质量相当于大约400万个太阳，可以容纳几百万个地球。
(第八句的上下文均围绕“超大质量黑洞”展开论述，未出现“黑洞的形成”的相关描述，因此第八句也为无关句)