如下图表示将植物放在不同浓度CO₂环境条件下，其光合作用速率受光照强度影响的变化曲线 。b点与a点相比较，b点时叶肉细胞中C₃的含量；b点与c点相比较，b点时叶肉细胞中C₃的含量的变化情况是(　　)

    ①When it comes to Chinese students considering studying in foreign countries, many of them usually believe that life will be easy and enjoyable. Unfortunately, it's likely that students with those beliefs will be disappointed very soon after landing at the airport.

    ②So, what are the problems you may have, and how can you deal with them?

    ③Teaching and learning styles in America are very different from those in China, requiring more critical thinking(批判性思维) and teamwork. In a normal American classroom, one project might be done by a study group in which every person has their own responsibility.

    ④So don't worry about your language or any grammar mistakes. Just watch what other students do, and don't be afraid of asking any question. The discussions, or sometimes even arguments, that your group members and you hold are likely to be the beginning of a friendship.

    ⑤Besides, schoolwork, another important thing faced by overseas students is homesickness or loneliness. You may miss your parents' cooking, your pets, or even your old bed. Being away from home can create bitter feelings, especially when faced with the challenges of getting used a new environment.

    ⑥What I strongly suggest is to try hard to deal with these feelings. Be open to new friendships. Sign up for school activities, and give yourself permission to enjoy life at school, even if you miss home a lot. Be organized and keep a diary to check your progress. Write down three new things that you're grateful for every evening, as well as three things you're looking forward to every morning.

    ⑦Studying abroad is never simple. In fact, there will be many difficulties every day. But I'm sure you will overcome your difficulties and make your time overseas a success.

Try to guess its meaning when you meet a new word. Don't _____ your dictionary all the time.

阅读下面的文章，回答下列各题。

让真诚给心灵环保

鲍震培

       诚心诚意是两千多年来儒家文化的传统美德，孔子说“巧言令色，鲜矣仁”。此处的“仁”是指真诚。在孔子看来，待人真诚不是表面文章，说得天花乱坠往往是假象，做善事应该是出于真诚的内心要求，而不是为达到某种目的讨好别人的手段。真诚是一种来自内心的情感，不虚伪，不掩饰。如果人只重外在的表现而忽略内心真实的情感，只是外表的作秀，演戏，玩假的，那是最没意思的事情。

       人是动物界中唯一可能最不真诚的，人会伪装，戴着面具，扮演各种各样的角色，所谓人生如戏，免不了的喜怒哀乐爱恨情仇，甚至许多时候需要善意的谎言。孟子说：“诚者，天之道也，思诚者，人之道也。”那么人心自有向上一路的向诚力量。朱自清在《论诚意》中认为，现实生活中，纯粹诚实的君子和诈伪的小人并不多见，常人往往沉浮于两界之间。我的一个朋友给人送礼，回来后总是如释重负地说又了却一桩心事，送礼在于她似乎不是一种内心所愿，而完全成了一种负担，失去了礼尚往来的初衷﹣﹣感恩或祝福。没有了最初的真诚，人际交往也成了莫大的包袱或者势利者攀附的台阶。

       要做到真诚，涉及两个问题，一是真诚对待生活中的每一个人；二是真诚也要看对象，用真诚的方式把事做好，把自己的社会角色扮演好。

       必要的“巧言令色”是可以的，一个求职者如果不擅言辞，一味刚毅木讷，恐怕连工作也找不到。再如做一个老师，他的真诚与他说话美妙动听、表情亲和并不冲突，因为他的内心是爱学生的。

       高尔基说：“走正直诚实的生活道路，定会有一个问心无愧的归宿。”真诚是人品，更是一种态度。

       龙年春晚演员唱歌走音，而只有王珞丹在微博里向观众道歉，其真诚态度受到了网友的称赞；前不久内地某红得发紫的女星在香港献唱，因音响故障被发现是对口型假唱，让人大跌眼镜，这种不真诚的艺德让人对她的人品产生了质疑。

       真诚往往是职业道德的底线，“童叟无欺”是卖方对买方的诚信。朋友家的小朋友曾去小区小卖部买冰糕，十根冰糕可以按批发价买，每根节省一角钱，这样买10根一元钱一根的冰糕，有9元钱就够了，但是孩子却只买回9根冰糕，原来那售货员告诉他一元钱1根，朋友找到那家店理论，痛斥他们这种对顾客不诚信的欺诈行为。骗局早晚会被揭穿，春晚蔡明的小品正是揭示了诚信的天网是疏而不漏的。

       文艺工作者的真诚是要向社会推出精神文明的产品，弘扬真善美的人格情操，当下一些影视剧却媚俗跟风，绯闻满天飞，剧情狗血雷人，价值取向上混淆正义与邪恶的界限，没有起码的是非观，误导青少年观众。强大的收视率所带来的利益驱动，使这样的“垃圾剧”充斥了银屏，这种娱乐圈的虚假繁荣不得不引起我们深深的忧思。

       最近影视演员陈坤在2011年“行走的力量”活动后出版了公益图书《突然就走到了西藏》，书中坦言“真实的丑陋比虚假的繁荣美一千万倍”。

       越来越多的人渴慕进藏，试图在高原简单的生活、圣洁的环境中得到心灵的净化，返璞归真。然而我们大多数人只是过平平淡淡的生活，怎样获得内心的澄净呢？其实道理很简单，如果一个人有精彩，到哪里都会是精彩。一个人的心中有美好，无需远行，也能看到美好的风景。保持你内心赤子般的真诚，真水无香，精诚所至，金石为开，让真诚回归，摒弃那些喧嚣和浮躁，给我们的心灵环保，家园会变得更美好。