26.F【解析】第五段第一句Because of their properties,noble gaseS have many important applica tions就讲明主旨:由于其特性惰性气体有很多重要应用。所以F选项What are the applications of no ble gases?惰性气体的应用正确。
27.A【解析】题意:惰性气体化学性质不。根 据第三段第二句These properties include being monatomic,colorless,odorless,being able to conduct electricity,and having low chemical reactivity可知情性气体化学性质不活泼。故A选项活跃的合适。
28.B【解析】题意:在惰性气体中,氦是。
根据文中的第三段最后一句Helium has the lowest molecular weight while Radon is the heaviest可得知,氦气是所有惰性气体中最轻的。故选B。
29.D【解析】题意:惰性气体外层电子数应为。根据第四段第三句Noble gases have a full outer shell,meaning that they have complete electrons in their outer shell可得知,惰性气体外层电子数应全满。故选D。
30.F【解析】题意:磁共振成像(MRI)可使手术。根据第五段最后一句MRI allows the doctor toseethe brain,without operating on the patient可知,通过MRI,医生可以不通过手术就看到患者头部影像。故选F。
第4部分:阅读理解
第一篇
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