在Rt△ABC中，∠C=90°，sinA=$\frac{4}{5}$，则cosB的值等于（  ）

    People are seeking for opportunities that will assist them in reaching their goals. Marketing yourself can be a good choice, which can help you achieve your goals. Though when people talk about marketing, they usually think that this is about producing a sale, it does not necessarily have to be.

    If you are an employee then you want your boss to take your ideas, and if you are on a job hunting then you want to find a good position. So in reality, marketing really leads to sale. So marketing yourself means you are simply “selling” yourself!

    The common problem in marketing yourself is that most people think that it is unpleasant to market themselves. They think that marketing concerns only to a business. Of course, this is absolutely not true. People who want to attain the success they desire must promote themselves.

    Marketing yourself is a useful tool. The better you market yourself, the more opportunities you will have. Marketing yourself does not really mean telling every person how beautiful and wonderful you are. It means letting your prospective employer know that you exist or you can do something better.

    There are actually several different ways of marketing yourself. But there are only two primary ways that you carry out. The first is to find ways to reach out to others and the second is to construct ways in order for the people to find you and make connection with you.

    To reach out and touch the lives of others, you have to be a good person and a good employee. In that way your good reputation will follow naturally. Have a brief and concise message that you can share with others. When you market yourself, you tell people who you are and what you can do for others. Plan well and practice your message.

    In constructing ways for the people to notice and make connection with you, you must be open to them. Communication is a great opportunity to make an impact especially when you market yourself. You also communicate by what you are wearing. Know the appropriate dress code and have plenty of time to decide what you will wear. Just remember to make a great first impression!

世界最高峰珠穆朗玛峰海拔为8844米，位于吐鲁番盆地的我国陆地表面最低点海拔为﹣155米，两地的相对高度是（　　）

阅读孙春龙的《救助》，完成后面小题。
        ①前些日子，我在长沙出差，有一次步行穿过侯家塘立交桥。
        ②这里是长沙城区的核心位置，人来人往。我低头刷着微博，无心留意这个城市的繁华。但当我路过那个坐在地上的老人时，她的衣着和周围环境的巨大反差，还是让我扭头看了一眼。我瞥见在老人的怀里躺着一个瘦小的孩子，我看到了她那一双清澈而又机灵的小眼睛。孩子的旁边撑着一把伞，勉强为两人遮挡一丝寒风。
       ③看着那把被寒风吹得摇摆不定的雨伞，我下意识地拉上了棉衣的拉链，像很多路人一样，面无表情地走了过去。
       ④走出去10余米的时候，我突然停下来，再次扭头看了一眼那个孩子。我心想，那会不会是一个被拐卖的孩子？在原地犹豫了几秒，我决定转身去看看。
       ⑤我抱着一丝怀疑折返。
       ⑥那位老人看出了我的迟疑，于是拿出了一张残疾证。她说，残疾证是她丈夫的，她的儿子离了婚外出打工，他们实在没有能力养家糊口了，就带着3岁多的孙女外出乞讨。残疾证或许是假的，我想，这是骗子惯用的伎俩。老人又拿出了一张证明，是村委会写的，很简单，只写了她是这个村的村民，并没有写她的家庭状况。
       ⑦我看到残疾证上有村委会的电话，我想我可以打电话核实。正当我准备掏电话时，一阵寒风将雨伞吹开，孩子的奶奶爬着把雨伞拉回来，然后把孩子紧紧地抱在怀里。于是我知道，自己多心了！
       ⑧或许老人感觉到，我并不是来施舍她的，便告诉我，她不愿意去救助站，因为在那里面吃不饱肚子，有一次孩子在里面还生了病，打了4天吊针。在老人的面前，有一块木牌，上面写着：请好心人不要给救助站打电话，我们不去。
       ⑨我掏出兜里仅有的3张20元纸币，塞到老人的手里。没想到，老人竟然失声痛哭，她苍老的脸颊上挂满了泪水。或许她能感受到，我不是在施舍。让我感到意外的是，她执意只留下一张钞票，将另外两张塞回我手里，她说：“好兄弟，我听你口音也是我们那一方的人，你出门不容易，不能让你断了盘缠。”
        ⑩那一句话，让我突然湿了眼眶。
        ⑪钱被我们推来推去，很多路人奇怪地看着这一幕。我把钱塞到小女孩的手里，看着她从奶奶的怀里掏出钱包，拉开拉链，把钱抚平了一张一张地装进钱包里，然后再拉上拉链，把钱包塞回奶奶的怀里。之后，她对着我很羞涩地笑了笑。
        ⑫钱包里除了一张10元纸币，剩下的全是1元的零钞。
        ⑬老人说，这孩子很机灵。他们去过救助站，但在那里连肚子都吃不饱。后来出来乞讨，最起码能吃个饱饭，或许还能攒点钱，以后送孩子去上幼儿园。
        ⑭有饭吃，有学上，这本是最基本的生活要求，但是对于她们来说却是奢望。
        ⑮就在我和老人交谈的时候，我看到一个女孩买来一袋糖果，放到了小女孩的怀里；我看到有人驻足，掏出身上的零钱放到老人面前的碗里。我看到旁人的眼光里，不再是冷漠或嫌弃，而是悲悯与和蔼。
       ⑯离开长沙之前，我再一次前往侯家塘，不过并没有找到那个乞讨的老人和那个机灵的孩子。或许我再也见不到她们了，但这些已经无关紧要了，重要的是，我们内心残存的悲悯是否已经开始苏醒。