题干

将函数的图象上所有的点横坐标伸长到原来的2倍(纵坐标不变),再把所得各点向右平行移动个单位长度,所得图象的函数解析式是          (   )

A:

B:

C:

D:

上一题 下一题 0.0难度 选择题 更新时间:2017-06-18 12:06:21

答案(点此获取答案解析)

B

同类题1

阅读下面的文言文,完成题目。

庐山黄石岩禅院记

刘轲

    古老有言曰:太极之气,积而为山岳,泄而为川渎。然则匡阜①之气,其大矣乎。

    庚辰岁,山客刘轲,采拾怪异,自麓至顶,却下半里余,次于黄石岩。岩中有栖禅子②,不知其几许腊,而瑰行峻节,人事难能。仆高其人,而信宿忘返。及颐其轻重,颇见其宅心之地,乃问其住年,但手指松桂云:“初毫发我植,今环人臂。乌飞兔走吾复何齿况卯戌之昏旦霜炎之冻炙生落之荣悴去留之沿溯虽云云自彼而于我蔑如也。”

    于戏!向非岩房峭绝,僧行孤峙,则人境两失。固其宜也,复何言哉?观夫烟云生于履舄③,岚霭出于襟袖,群形浩扰,并入眸子。每至烟雨初霁,山光澄练,泠泠仙语,如在耳右。况又耸凌兢上,焉知不能与洪崖④接袂,浮丘连驾,盈缩造化,吐纳颢气,绝惭容于厚面,远喧卑于腥秽乎?不得而然者,盖钩也、饵也,名为利钩,利为名饵,吞钩食饵,手足羁锁,彼焉得跳跃于此乎?夫禅子脱去桎梏,四支宣展,动与云无心,静将石何机,物我一致,端邪塞径,仆所谓非斯人不能住斯境也。

    禅师宜春人,俗姓刘,名常进,时人以师久住,遂以其姓易其岩名也。

(选自《晚唐小品文选译》)

【注】①匡阜:庐山。亦称“匡庐”。②栖禅子:栖居行禅的僧人。③舄(xì):古代一种复底鞋。④洪崖:传说中的仙人。

同类题5

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    Sandra Bullock turned 51 last month. But because she looks exactly the same as she did in Miss Congeniality, a movie filmed back in the 20th century, everyone calls her “ageless.” Bullock is just one of a number of stars in their 40s and 50s who've had birthdays recently but have not gotten older, unlike the rest of us in their age group. Take Halle Berry. One website put a photo of her 20 years ago next to one of the newly 49-year-old Berry and dared us to choose which was which. “This Is What 49 Looks Like,” it said. Seriously, if that's what 49 looks like, I must be 71.

    However, even a generation ago, famous faces evolved. Look at a picture of Grace Kelly at age 52 in the early 1980s. She looks like a beautiful middle-aged woman. Today she'd look old for her age.

    The goal now is to prevent aging while you are still young, using all the magical nonsurgical options medicine has to offer. Eventually these techniques will become less expensive, and ordinary people my daughter's age will have them. Already anti-aging is starting to be considered maintenance, like coloring your hair. My friends and I find ourselves openly debating techniques that we used to make fun of. Does fat-freezing work? How much time do you have to spend in the gym to keep the body of a 35-year-old after 50? It's all so exhausting. But members of the next generation have it tougher. They'll have to ask themselves whether they want to spend their youth trying not to get old. I've already seen “Sexy at 70” headlines. Will everyone be expected to go to their graves(坟墓) looking hot?

    I also have to wonder what else we are slowing along with age. How do you move on if you're working so hard to stay the same? And besides, if you've known the ache of watching a daughter pack up for college, you know you can't stop the clock.