阅读下面的文字，完成文后小题。

    刘颂，字子雅，广陵人，世为名族。颂少能辨物理，为时人所称。察孝廉，举秀才，皆不就。文帝辟为相府掾，奉使于蜀。时蜀新平，人饥土荒，颂表求振贷，不待报而行，由是除名。

    武帝践阼，拜尚书三公郎，典科律，申冤讼。累迁中书侍郎。咸宁中，诏颂与散骑郎白褒巡抚荆、扬，以奉使称旨，转黄门郎。迁议郎，守廷尉。时尚书令史扈寅非罪下狱，诏使考竟，颂执据无罪，寅遂得免，时人以颂比张释之。在职六年，号为详平。会灭吴，诸将争功，遣颂校其事，以王浑为上功，王浚为中功。帝以颂持法失理，左迁京兆太守，不行，转任河内。临发，上便宜，多所纳用。郡界多公主水碓，遏塞流水，转为浸害，颂表罢之，百姓获其便利。寻以母忧去职。服阕，除淮南相。在官严整，甚有政绩。旧修芍陂，年用数万人，豪强兼并，孤贫失业，颂使大小戮力，计功受分，百姓歌其平惠。

    元康初从淮南王允入朝会诛杨骏颂屯卫殿中其夜诏以颂为三公尚书又上疏论律令事为时论所美。久之，转吏部尚书，建九班之制，欲令百官居职希迁，考课能否，明其赏罚。贾郭专朝，仕者欲速，竟不施行。

    及赵王伦之害张华也，颂哭之甚恸。闻华子得逃，喜曰：“茂先，卿尚有种也！”伦党张林闻之，大怒，惮颂持正而不能害也。孙秀等推崇伦功，宜加九锡，百僚莫敢异议。颂独曰：“昔汉之锡魏，魏之锡晋，皆一时之用，非可通行。九锡之议，请无所施。”张林积忿不已，以颂为张华之党，将害之。孙秀曰：“诛张、裴已伤时望，不可复诛颂。”林乃止。于是以颂为光禄大夫，门施行马。寻病卒，使使者吊祭，赐钱二十万、朝服一具，谥曰贞。

    初，颂嫁女临淮陈矫，矫本刘氏子，与颂近亲，出养于姑，改姓陈氏。中正刘友讥之，颂曰：“舜后姚、虞、陈、田本同根系，而世皆为婚，礼律不禁。今与此同义，为婚可也。”

    史臣曰：子雅束发登朝，竭诚奉国。逮元康之间，贼臣专命，举朝战栗。颂以此时，忠鲠不挠，哭张公之非罪，拒赵王之妄锡，虽古遗直，何以尚兹？

（选自《晋书·列传第十六》，有删改）

完形填空

            As scientists learn more about the causes of earthquakes, they become better able to predict them. First of all, they know that quakes are1to occur in areas where the tectonic(地壳构造的)plates push2each other. They3these areas closely, using different instruments. They4the vibrations(震动)of the earth with seismographs(地震仪), which5on rolls of paper all movements, both large and small. Scientists usually use the Richter scale(里氏震级)，6after a famous seismologist, for these measurements. When an earthquake measures over 4.5 on the Richter scale, it is7enough to cause damage. Scientists have determined that a(an)8is not likely to have a large9when many small quakes have been10. When the small quakes stop, then pressure11and a strong quake is more likely.

          There are several other12to predict earthquakes. Scientists can measure the tiny13in the tilt(倾斜)of the land that happen before an earthquake occurs. Increases in the amount of radon(氡), a substance found in deep14， as well as a high level of water in the wells, can also15that an earthquake is likely to occur. In addition, scientists have found that some animals, like dogs, behave16before an earthquake: they become17and howl.

           Seismologists have18_predicted several earthquakes, such as the earthquake which occurred in Zhangjiakou, China in 1998. 19，  not all earthquakes are predictable, and a system for predicting is not yet20.

人体内的细胞与外界气体进行气体交换要经过（  ）

等腰直角三角形的对称轴是（  ）