下面是生物膜的结构模型示意图，据图回答下列问题：

（1）生物膜的流动镶嵌模型认为，图中②所示的____ 构成了膜的基本支架，它像轻油般的流体，当细胞吸水膨胀时厚度变小，这说明②具有____ 

（2）葡萄糖跨膜运输时，需要图中的物质____ （填编号）协助，该物质的化学本质是____ ．

（3）科学家设计出一种人工膜结构，这种膜结构能将有毒重金属离子阻挡在膜的一侧，以降低污水中的有毒重金属离子对水的污染，这是模拟生物膜的____特性．

    陆游是宋朝时期著名的爱国诗人。他从小就受到了父亲的教育，立下报国之志。

    他30岁那年，参加了礼部举行的考试，以优异的成绩获得了第一名，但遭到了大奸臣秦桧的打击，被除掉了姓名。然而，这一打击并没有使陆游灰心。回家以后，他仍然刻苦地攻读兵书，认真练武，准备为国建功立业。

    陆游34岁时当上了一个县官的属员。后来，他凭着才能又担任了一个较大的官职。可没过多久，他又一次因为坚决主张北伐，受到了投降派的排挤，被罢免回乡。

    公元1170年，45岁的陆游投奔于积极抗金的王炎旗下，真正过上了军营生活。在军旅的生活中，他竭尽全力为收复祖国北方的失地而努力。他多次亲临前线去视察，感受到广大人民渴望收复失地的强烈愿望，写下了不少爱国诗篇。后来，因南宋皇帝屈膝投降，陆游的希望又一次破灭了。

    公元1210年，陆游已经是85岁的老人了，但他仍然念念不忘北伐，念念不忘收复北方的大好河山。有一天，他的身体已十分虚弱，躺在床上动也不动，眼神失去了光彩，嘴里不停地喘着粗气。但是，当他看到乡亲们和他的儿子来到他跟前时，忽然振作起来，瞪大了眼睛，吃力地抬起头，要儿子把纸和笔拿来。当他的儿子把纸和笔捧到他跟前时，他用力支撑着，写下了《示儿》这首诗：“_______________，_______________。_______________，_______________。”写完之后，他闭上眼睛，与世长辞了。

    陆游虽然逝世了，但他的爱国诗篇为广大人民所传诵。

根据短文内容填空。

    Students these days often have a lot of worries. Sometimes they have problems with their schoolwork, and sometimes with their friends. What can they do about this? Some people think the worst thing is to do nothing. Laura Mills, a teenager from Washington, agrees.    "Problems and worries are normal in life," says Laura. "But I think talking to someone ____ a lot. If we don't talk to someone, we'll certainly feel worse "

    Laura once lost her purse, and worried for days. She was afraid to tell her parents about it. She even walked three miles to school each day because she didn't have any money. She just ____ thinking, "If I tell my parents, they'll be angry!" But in the end, she talked to her parents and they were really understanding. Her dad said he sometimes made careless mistakes himself. They got her a new purse and asked her ____ more careful. "I will always remember____ my problems in the future!" Laura says.

    Robert Hunt advises students about common problems. He feels the same way as Laura. "It is best not to avoid our problems. We should always try to solve them." He thinks that you can first find someone to talk to. This person doesn't need to be an expert (专家) like himself. Students often forget that their parents have ____ experience than them, and are always there to help them.

    In English, we say that sharing a problem is like cutting it in half. So you're halfway to solving a problem if you talk to someone about it!

《伏尔加河上的纤夫》是19世纪俄国批判现实主义画家列宾的力作，它反映出当时的俄国(　　)