下表为1952年新中国对高等院校进行院系调整后的相关数据。这次院系调整的主要原因是(    )

补写出下列句子中的空缺部分。

①杜甫在《登高》中发出“____，____”的感慨，抒发漂泊异乡、体弱多病的惆怅之情。

②在《赤壁赋》中，苏使用“____，____”两句概括了曹操的军队在攻破荆州后顺流东下的军容之胜。

③李贺在《雁门太守行》中从声、色两方面渲染战场的悲壮气氛和表现战斗的残酷的两句是“____，____”。

细胞膜在生命活动中具有重要作用．下列相关叙述错误的是（　　）

   In many high schools，there are strict rules about using mobile phones. If your phone rings in class，for example，the teacher will be very angry.
   Every mobile phone has a ringtone (铃声). It tells you that someone is calling you. Now，there is a ringtone called “mosquitotone (蚊子铃声)”. Using it，students can receive calls and text messages (短信) in class but the teacher will not realize what is happening. How?
   Mosquitotone has a special sound. Only children and teenagers can hear it. As we get older，we are unable to hear some sounds with high frequencies (频率). As a result，a child or teenager can hear the mosquitotone ringtone, but it's_inaudible_to someone 20 or older.
   But sometimes，people over 20 can hear the ringtone. One British student's phone uses mosquitotone. In class，the student's phone rang. The 32­year­old teacher looked at the student and became unhappy. “I heard that. You know the rule：no mobile phone in class.”
   Not all the students are interested in mosquitotone. Jerry Jones，a high school student of 17，says，“Using mosquitotone too often is bad for our hearing. I may use it for pleasure，but not in class. It's unfair to the teachers！”
   What do parents think of mosquitotone？“I think it is perfect for places like movie theaters，” says Connie Neeson,44.“Think about it. Yon're watching a film and someone's mobile phone rings. Mosquitotone is good because many people don't hear it. However，it also has a bad influence on their study if students use it in class.”

如图所示各图是***在近代不同时期的几幅图片，其中反映了他在党的核心领导地位得以确立的图片是（　　）