阅读下面短文，从短文后所给的A、B、C四个选项中选出最佳选项，以填入空白处的最佳选项。    

    "Sesame Street" is a TV programme for children. It first appeared in New York 1 1969. It is called "the longest street in the world". That's because the TV programme by that name can be seen in so many parts of the world.

    In the US over six million children watch the programme regularly. The viewers include more than half the nation's pre-school children. Parents love the programme. Many teachers also think it is very helpful, 2 some educators are against certain things in it.

    Tests show children from different background have benefited from watching the programme. Those who watch it five times 3 week learn more than those who watch it once in a while.  In the US the programme is shown at 4 hours so that more children can watch it. The programmes all 5 songs, stories, jokes and pictures to help children understand numbers, letters and human relationship. But there are some differences. For example, the programme made in Mexico City devotes more time to teaching whole words than to teaching letters one by one.

    Why is "Sesame Street" more successful than other children's shows? There 6 many reasons—the good education of its producers, the support 7 the government and businesses, and the skillful use of many TV tricks. Also 8 watch it with their children. This is partly because famous adult stars often appear on it. But the best reason may be that it makes every child 9 able to learn. Children find themselves learning, and they want to learn 10 .

水是一种重要的自然资源。下列对水的认识正确的是

阅读下文，完成1-5题。

采菊易杨下

速生易杨林的叶子被秋风吹得稀疏，老秦家的胎菊就要收获了。射阳人爱把制茶用的菊花种在易杨树下。夏天，易杨的浓荫可以挡日头，防止一望无际白晃晃的太阳把菊花苗烤焦。等菊花要结胎了——长出了累累重重的花苞——易杨林也开始落叶，把珍贵的阳光让出来。

采摘胎菊要赶时辰，等花苞全炸开来，菊花的花粉散逸到空气中，就只能制作白菊茶了，保健作用和浓香味大减。因此，上好的胎菊要趁花苞完全长鼓，第一枚花瓣刚刚翘起，就像婴儿团拢的小拳头忽然张开了他的小拇指，就可以采摘了。

老秦两口子都是早上五点即起，开始趟着露水采摘胎菊。七点钟，直起腰来准备吃早饭时，裤腿上的露水印子已爬到离膝盖只有十厘米的地方。胎菊的花粉，把裤脚都染香染黄了。老秦走到哪儿，都有蜜蜂嘤嘤嗡嗡跟着。

早一次晚一次的采摘，要持续差不多一个月，这对年过六旬的老秦夫妇来说，是体力上的考验。此刻，他们比平时更盼着儿女们周末开车回来帮忙，好让他们的老腰歇一歇。老秦的孙子9岁，外孙女7岁，易杨树下的胎菊丛，是他们玩耍的乐园。不仅如此，这两年，每到收获季，儿女们还把他们的同事和朋友也带来了，城里客人大多带着小孩子，由着他们在易杨林里撒个欢，呼吸一下新鲜空气，老秦觉得易杨树林里添了许多生气。

易杨林里不但可收一袋袋的胎菊花，还可收获一窝窝的白蘑菇。老秦亲自上灶，用自家榨的菜籽油煎蘑菇片给大家吃。厚切的蘑菇片上鼓出金黄的小油泡，香气散出老远，往往还没上桌，就被小孩子们抢吃一空。老秦的儿子抢到了一片，说这蘑菇还是这样白煎了好吃。射阳离海近，土壤有盐分，加上易杨树下每年堆积了那么多腐叶，出产的蘑菇肥腴鲜香，韧性十足，倒有几分像松茸的味道。

吃了老秦家的土灶饭，第二天一早，城里来客也不管皮鞋是否被露水浸得塌软，风快麻利地干了一气，把该收的胎菊都收了，把该收的苹果也收了。老秦家还种着二三十棵苹果树，基本不用联系销售，都是儿女们的同事和朋友买走了。春天就订了货，秋天自己来采摘。苹果的颜色浓郁如油画，一半被秋阳烤成了橙红色，另一半还是青黄的，个头儿都不大。果树下埋过有机肥，又基本不打药，苹果在衣服上擦一擦就能吃。来客咬第一口时多半呛着了——这样喷涌而出的果汁，令人猝不及防。

所有的小孩子都乐不思返。等到老秦帮着把成筐的苹果搬上汽车后备箱，老秦妻子把胎菊茶怎么泡、菊花枕怎么用都交待好，汽车喇叭催了一遍又一遍，孩子们还在易杨林里呼喊玩耍。那时刻，黄海之滨的落日如此辉煌，易杨林的尽头云深如墨，云层的缝隙里蜿蜒着一条金龙，那金龙几秒间就幻化成丝带，兜着红纱灯一样的落日不让它下坠。这种辉煌持续了约一分钟，空气里弥散着胎菊的干爽药香，城里客都看呆了。

有一次城里客返程路上，儿子发来短信：“爸，同事说小伢子们到你这儿来了以后很神奇，肯干活，还不要冰激凌肯德基之类的奖赏。”老秦笑笑，自言自语道：“劳动本身不就是一种奖赏吗？”

                                             （明前茶/文，选自《扬子晚报》）

煤矿的矿井里为了防止“瓦斯”(甲烷)爆炸事故，应采取的安全措施是(  )