方向导数与梯度

Judy works in a sports shop.SHE loves all kinds of sports.SHe can swim and skate very well.She often plays basketball and volleyball.These days,she is taking her tennis lessons at a tennis club,She goes to the club at weekends.There she meets Kate an There are many ways to____in cold winter.A.keep quiet B.enjoy ourselves C.go out D.have fun上文的意思应该选的是B或者D其中一个,我应该选哪个啊 英语的,阅读理解,求解答啊大神 Robert Frost was perhaps one of the most popular and beloved of the twentieth century American poets.In many ways his works are related to nature and his New England surroundings.To Frost,nature is a source of wisdom as well as a source of joy.Nearly 请问平时如何为四级做准备?说的具体点,比如听力,阅读平时应该怎么训练. 准备考英语四级,练习的时候做预测题和真题有什么区别?哪个更好一些? 如何练习英语四级阅读 准备考四级,如何练习听力? 为考英语四级需要做哪些功课和准备?包括看什么书,做什么习题,为考英语四级需要做哪些功课和准备?包括看什么书,做什么习题,听什么听力 英语这道题选哪个?为什么?THKS!2.John plays football _______,if not be better than David.A.as well B.as well as C.so well D.so well as我找到答案了：【分析】此句的正常结构是这样的John plays football as well as David,if h 英语几道题目帮我看下根据句意,用括号中动词的适当形式填空.1.The park is a good place ___to meet______(meet) friends .2.They __are planing______(plan) to have a trip now .3.Mr.Smith goes _jog_______(job) every morning .4.We ar 求 2012年考研英语真题 原文朗读 mp3 ~~谢谢! 2005年真题阅读 词汇翻译 考研英语If we are ever going to protect the atmosphere, it is crucial that those new plants be environmentally sound.我想知道这里的ever是什么意思,如何翻译 2010年考研英语阅读及翻译题的来源?2010年1月MBA翻译题的来源? 英语翻译本人基础不好,前两个月每天做一篇基础阅读,现在想开始做真题,我意思是做完题后需要一句一句翻译吗 英语阅读表达题,While it is impossible to live completely free of stress,it is possible to prevent stress as well as reduce its effect when it can’t be avoided.The US Department of Health and Human Services offers the following suggestions fo 英语阅读求解,问题在你回答之后发给你.百度知道只能发一张图. 如图解答英语阅读 英语阅读求解答,题目等会发 英语阅读理解（因为提问只能发一张照片所以只有文章,） 英语阅读题 The baby was sleeping and （）hurt at all.A isn't B didn't C wasn't文章大意是讲汶川地震母亲护着孩子,自己死了,手机上写短信的那件事我的疑问也是B和C到底是哪个 急求解英语阅读题!How many children do the majority of chinese families now have?What dose he or she receive as the oniy child in the family?How does the oniy child feel?Why do the only children require longer period to season the change in th 英语阅读理解题求解 求解一道英语阅读理解的题目语篇如下：Eddie McKay,a once-forgotten pilot,is a subject of great interest to a group of history students in Canada.It all started when Graham Broad,a professor at the University of Western Ontario,found M 求解一道英语阅读理解题Reading ComprehensionIn the last 500 years, nothing about people---not their clothes, ideas, or languages—has changed as much as what they eat. The original chocolate drink was made from the seeds of the cocoa tree 英语翻译Travel Spotlight:ParisFor your next vocation,why not consider visiting Paris?Paris is the capital of France and is one of the liveliest cities in Europe.It doesn't have any beaches or mountains,but there are still many things to do there. 英语翻译记住离开房间前要关上窗户.Please _____ ______ ______ the window before leaving the room.事故在昨天发生.The ______ _______ ______ yeserday.按计划会议在9点举行了.The meeting ______ _____ at 9:00 as planned.我碰 英语翻译前几天,我偶然地发现了事实 英语翻译4:02时用英语怎么读? 英语翻译注意天气情况.对于慈善步行极好的一个地方.在平地上放风筝.我还需要带上什么呢?如有必要带上一把伞.对于她来说带上地图是明智的. 英语翻译翻译下这篇短文,急用!In 1938,a radio program by actor Orson Welles announced that aliens from Mars had landed on the Earth.He described where they had landed and told how they were moving across the United States.Welles was so con 英语翻译Recently I was walking in town when I saw a group of school students in uniform.I was shocked to see that the girls's skirts were very short and they were wearing a lot of make-up.The boys looked very untidy.Their shirts were dirty and so