下列关于细菌和病毒的说法中，正确的是（　　）

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                                                                              一百美元
         ①暑假终于到了，约翰迫不及待地往家乡赶，他要去看望奶奶。
         ②奶奶是德国人，爷爷是美国人，他们在一起幸福地生活了大半辈子。奶奶不懂英语，只会说德语，除了爷爷和家人，她不愿意跟别人交流。更糟糕的是，她患有白内障，视力非常差。去年，爷爷去世了，奶奶不愿意离开他们共同生活的地方。约翰不知道，孤单的奶奶该如何生活。给爷爷办完丧事，约翰父母临走时给奶奶留下了一个可以异地取款的存折和100美元现金。
         ③看到孙子，奶奶非常高兴，她挎上菜篮子就说：“我去买你最爱吃的鳕鱼。”然后，她去了窗台，约翰看到窗台上放了一大把钱，有零有整，奶奶把钱全部拿在手上就出去了。
         ④“钱怎么能放在窗台上呢？只要窗子一开，路人随手就能拿走。”约翰想，等奶奶回来，他就让奶奶把钱放到电视柜子上面。奶奶说：“没必要，我这一年还没丢过钱呢。”但她还是采纳了孙子的建议。
         ⑤第二天，奶奶买了东西回来，还是顺手把钱丢在了窗台上，约翰再次帮她收拾好了。
        ⑥第三天，奶奶依然如故。约翰知道这是习惯使然，他再次从窗台上拿起奶奶买东西找回的钱放到了电视柜子上，并顺便把那些钱整理了一下。在整理的时候，他发现了一个奇怪的现象，奶奶的钱增加了！他记得第一次整理的时候是368美元，可现在3天过去了，奶奶买了不少东西，钱数却变成了405美元。
        ⑦难道奶奶口袋里还有钱？可他明明看到，奶奶每次出去都是从窗台或电视柜子上把钱全部拿走，回来后再全部丢在窗台上，她身上应该不会有钱，增加的钱是从哪儿来的呢？
        ⑧晚上，约翰接到了爸爸的电话。爸爸说，他前几天查了奶奶的账户，发现奶奶从没取过他们存的钱。奶奶手里只有他们走时留下的100美元现金，这一年来她是怎么生活的呢？约翰知道，小镇上的生活标准每月最低也得1000美元，就算奶奶再节约，也不可能100美元用一年啊！
        ⑨约翰把爸爸的疑问说了一遍，奶奶茫然地看着那沓钱说：“我也不知道是怎么回事，我不会从银行取钱。我也不认识美元，我不知道那是多少。”
       ⑩奶奶不懂英语，不认识美元，约翰是知道的，他不明白的是，奶奶是怎么用钱买东西的。奶奶说：“我每次买东西的时候总是把手里的钱全部给卖东西的人，让他们自己拿钱和找钱，我想别人是不会坑我这个老太太的。”哪有这样买东西的？约翰感到很可笑。他决定跟踪奶奶一次，看她究竟是怎么买东西的。
        ⑪第二天，约翰悄悄地跟在奶奶后面。果然，奶奶买水果时，一下子把钱全部拿出来，让卖水果的人自己拿钱。约翰发现卖水果的人从奶奶手里拿出一张10美元的钞票，却放回了两张5美元，他等于没收奶奶的钱！接下来，他看到的情况都差不多，有不收奶奶钱的，还有多找奶奶钱的……
       ⑫约翰的眼睛湿润了。他明白了，这都是小镇上的人们在帮助无依无靠的奶奶！
       ⑬约翰找到了镇长，感谢小镇人一年来对奶奶无声的照顾。镇长说：“以前都是你爷爷跟别人打交道，他去世后，你奶奶开始进入社会生活中。刚开始小镇上的人还感到这个老太太真是奇怪，后来才知道她根本不认识钱，没人愿意欺骗一个不认识钱且完全信任别人的人，于是就出现了这种现象。其实，不是我们在帮她，而是她在帮我们，小镇上原来也有坑蒙拐骗的现象，自从碰到对人没有丝毫防备的约翰老太太后，这种现象才没有了。我们应该感谢你奶奶才对啊！”

阅读理解

    The plants grown by Wageningen University researchers in Mars-like soil back in March have been analyzed and the results are excellent: at least four of the crops do not contain harmful heavy metal levels and are perfectly safe to eat, the University researchers report.

    If you've seen The Martian, you can remember how much Matt Damon got done living off of his poo-powered crop of potatoes. It just goes to show how important it is for a long-term colony to be able to grow their own food locally. We've taken one step closer to that goal in March, when Netherlands' Wageningen University reported that they've managed to grow ten different crops in Mars-like soil.

    However, growing food doesn't do us much good if eating it kills us, and researchers were worried that these crops contained dangerous heavy metals like lead or cadmium(镉) from the martian soil. But future colonists are delighted, as lab analysis of the crops determined that at least four of them are safe to eat.

    Led by ecologist Wieger Wamelink, the team tested radishes, tomatoes, rye, and peas. They looked at cadmium, lead, aluminium(铝), nickel(镍), copper, chrome(铬), iron, arsenic(砷), manganese(锰), and zinc(锌) contents in the plants, and didn't find any in dangerous levels. In fact, some of these vegetables have lower levels of heavy metals than those grown in regular potting soil. The plants were also tested for vitamins, alkaloids(生物碱), and flavonoids(类黄酮), with good results. While there are six more crops to test, Wamelink himself said that the results up to now are “very promising.”

    “Growing food locally is especially important to our mission of permanent settlement, as we have to ensure sustainable food production on Mars. The results of Dr. Wamelink and his team at Wageningen University & Research are significant progress towards that goal,” said Mars One co-founder and CEO Bas Lansdorp in a press release.

    A crowdfunding campaign is underway (and will be until the end of August) to fund the test of the remaining crops, potatoes included. If all the crops test out safe, with concentrations of heavy metal the FDA and the Dutch Food Agency consider as safe, Wamelink's team will host a “Martian dinner” at the Wageningen greenhouse. But I've seen the movie. Stay clear of the potatoes.

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④佛印绝类弥勒____

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