现在的天文学，不只是研究太阳、月亮、星星在天上的位置和运行规律，还要研究星星里面的变化，研究宇宙的演化。 对这段话的准确复述是( )。
A．现代天文学只研究星星里头的变化
B．现代天文学不仅研究星体的运行规律及其内部变化，而且还要研究宇宙的演化
C．现代天文学只研究太阳、月亮和星星在天上的位置和运行规律
D．现代天文学是一门综合性的学科
参考答案：B
解析： 该句话即是说明现在的天文学研究的内容，不只是星体的运行规律，还有内部的变化、宇宙的演变，故选项B是最全面的。
| 完形填空 | ||||
| In my dual (双重的) profession 1 an educator and health care provider,I have worked with many children infected with HIV. They have taught me so many things, but I have especially learned that great 2 can be found in the smallest individuals. Let me tell you about Tyler. Tyler was 3 infected with HIV；his mother was also infected. From the very beginning of his life, he was dependent on medications to 4 him to survive. When he was five, he had a tube inserted in a vein(静脉) in his chest. At times, he also needed extra oxygen to support his 5 . Tyler wasn't 6 to give up one single moment of his childhood to this deadly disease. It was not 7 to find him playing and racing around his backyard, wearing his medicineloaded backpack and 8 his tank of oxygen behind him in his little wagon (小手推车). All of us who knew Tyler were impressed by his pure 9 in being alive and the energy it gave him. Tyler's mom often 10 him by telling him that he moved so 11 she needed to dress him in red. That way,when she peered through the window to check on him playing in the yard,she could quickly 12 him. This deadly disease eventually 13 down Tyler. He grew quite ill and, unfortunately, 14 did his HIVinfected mother. When it became 15 that he wasn't going to survive, Tyler's mom talked to him about 16 . She comforted him by telling Tyler that she was dying too,and that she would be with him soon in heaven. A few days before his death,Tyler 17 to me to come to his hospital bed and 18 ,"I might die soon. I'm not 19 . When I die,please dress me in 20 . Mom promised she's coming to heaven, too. I'll be playing when she gets there, and I want to make sure she can find me." | ||||
|