san Francisco,cachinnation的意思是?

一个小小的英语问题,
元音音素开头的名词前面用an,可是为什么书上说："an SF(San Francisco) Giants baseball cap"?

求翻译成中文
At the University of California, San Francisco, scientists have found that when rats have a new experience, like exploring an unfamiliar area, their brains show new patterns of activity. But only when the rats take a break from their exploration do they process those patterns in a way that seems to create a persistent memory of the experience.
The researchers suspect that the findings also apply to how humans learn.
“Almost certainly, downtime lets the brain go over experiences it’s had, solidify them and turn them into permanent long-term memories,” said Loren Frank, assistant professor in the department of physiology at the university, where he specializes in learning and memory. He said he believed that when the brain was constantly stimulated, “you prevent this learning process.”
At the University of Michigan, a study found that people learned significantly better after a walk in nature than after a walk in a dense urban environment, suggesting that processing a barrage of information leaves people fatigued.
Even though people feel entertained, even relaxed, when they multitask while exercising, or pass a moment at the bus stop by catching a quick video clip, they might be taxing their brains, scientists say.
“People think they’re refreshing themselves, but they’re fatiguing themselves,” said Marc Berman, a University of Michigan neuroscientist.
Regardless, there is now a whole industry of mobile software developers competing to help people scratch the entertainment itch. Flurry, a company that tracks the use of apps, has found that mobile games are typically played for 6.3 minutes, but that many are played for much shorter intervals. One popular game that involves stacking blocks gets played for 2.2 minutes on average.
Today’s game makers are trying to fill small bits of free time, said Sebastien de Halleux, a co-founder of PlayFish, a game company owned by the industry giant Electronic Arts.
“Instead of having long relaxing breaks, like taking two hours for lunch, we have a lot of these micro-moments,” he said. Game makers like Electronic Arts, he added, “have reinvented the game experience to fit into micro-moments.”
Many business people, of course, have good reason to be constantly checking their phones. But this can take a mental toll. Henry Chen, 26, a self-employed auto mechanic in San Francisco, has mixed feelings about his BlackBerry habits.
rengong

金山、旧金山、新金山
据说，美国城市旧金山（San Francisco，音译“圣弗朗西斯科”或“三藩市”）之所以叫“旧金山”，是为了区别于澳大利亚城市“新金山”（Melbourne，墨尔本）。是先有“旧金山”，还是先有“新金山”？从字面上看，应该是先有“旧金山”，后又“新金山”，对吧？世界上有没有一座叫“金山”的城市？“金山”的英文是什么？

Chinatown,San Francisco,is the second largest Chinese community outside Asia.Let's go for a walk through Chinatown now.It has twenty-four square blocks.In the streets you can hear Chinese more than English.
The centre of Chinatown is Stockton Street.It has Chinese fish,fruit and vegetable markets,bakers and spice shops.And it doesn't cost too much!The Chinatown Youth Centre is at 777 Stockton Street.Open Monday to Friday,the telephone number is
415-398-5442.
Well,are you tired after the shopping?Do you enjoy drinking tea?Let's go into the Imperial Tea Court on Powell Street for some Oolong tea.And now let's walk on.
Time to eat?Do you like to eat Shangai-style food?Well,then the place to stop is Fourtain Court at 354 Clement Street.There are so many nice dishes on the menu.And we had Beijing Duck and a whole steamed fish.
就上述信息完成问答.
例1.-What __is__ Chinstown in San Francisco __like__?(like)
-______________________________________________
2.-How many _____ can we _____ in the streets?(language)
-______________________________________________
3.-What ______ we _______ in Stockton street?(buy)
-________________________________________
4.-What ______ I _______ if I feel hungry?(eat)
-_____________________________________

this novel is__ in the modern city,San Francisco,so once __,it will be very popular.
A.put publishes B.set having published C.put publishing D.set published

There are weekend visits( ) to San Francisco.A.organized b.to organize 为什么选A

This novel is set in the modern city, San Francisco, so once_______, it will be very popular. A．publishes B．having published C．publishing D．published

San Francisco is a famous city ______ America.

[ ]

A. in B. on C. to

首字母填空
Dear citizens(市民) of San Francisco,
The people of Chinatown(唐人街) want to invite(邀请) you to c___________ the Chinese New Year with us.
We are a long w_________ from our homes in China.San Francisco is our home now.We love our new city but because we also love our own(自己的) c_________,we have made one small part of the city look l________ China.We think it is the most famous(著名的) Chinatown in the w_________.It is also more famous than Japantown or Koreatown in San Francisco.
So,please come to Chinatown to enjoy many different kinds of Chinese f_______.We have Beijing Duck,Nanjing Duck and Hong Kong wonton soup.After dinner,take a look at the many different shops.B________ some Chinese paintings,calligraphy(书法),clothes and silk.We also sell(卖) Chinese music CDs and kung fu films on DVD.You can p___________ your Mandarin(国语) and Cantonese (粤语)because people from all parts of China live in Chinatown.At New Year,we have dragon dancing and fireworks.
So,we w________ you a Happy New Year,and we hope the new year bring you l________ and happiness!
Chinese community
1.­­­­­­­­­­­­­­­­­­­­­___________2.___________3.___________4.___________5.___________
6.___________7.___________8.___________9.___________10.__________
1.What festival is talked about in the passage?
_________________________________________________________________________
2.According to the passage,who lives in Chinatown?
________________________________________________________________________
3.According to the passage,what can you buy in Chinatown?
_________________________________________________________________________

阅读理解

san francisco is a spectacular city. it is famous for its steep hills, its earthquakes and the prison island of alcatraz, but its most famous landmark is the golden gate bridge. this is one of the most beautiful bridges in the world. it has a simple, graceful shape, and is painted in an attractive orange. work on the golden gate bridge started in 1933 and continued for the next four years. the total cost of the bridge was us$35 million. at that time, its span of 1,200 meters made the golden gate bridge the longest suspension(悬浮) bridge in the world. the bridge is 2.7 kilometers long and, at the middle point, 70 meters above the water of san francisco bay. the main cables that hold the bridge are one meter in diameter. the bridge can safely withstand(抵挡) winds of up to 160 kilometers an hour, and it can sway(摇摆) as much as 8 meters in strong winds. on thursday, may 27, 1937, 200,000 people walked across the bridge to mark its opening. people are still allowed to walk across: it takes about half an hour each way. it is worth the effort. as you cross, you understand the engineering skill that went into the construction of the bridge. you also get wonderful views of san francisco and the bay area. the golden gate bridge has been the scene of many events since it was completed. it was shaken by the earthquake of ***. daredevil(喜欢冒险的) pilots have flown their planes under it. sadly, too, some people have taken their own lives by jumping from the bridge. but throughout its history, the golden gate bridge has been the symbol of san francisco, like the temple of heaven symbolizes beijing and the eiffel tower symbolizes paris

1. how many things make san francisco famous?

a. two (its history and its present). b. three (steep hills, earthquakes, the prison island of alcatraz). c. four (golden gate bridge, steep hills, earthquakes, the prison island of alcatraz). d. five (the orange color of the bridge, the shape of the bridge, steep hills, earthquakes, the prison island of alcatraz).

2. the golden gate bridge has been there for ______ years.

a. less than 70 b. more than 70 c. about 15 d. about 50

3. what is true about the bridge?

a. it was greatly damaged by the earthquake in ***. b. it can fight back strong winds of up to 180 kilometers an hour. c. it has caused many deaths since its opening. d. it is the symbol of the history of san francisco.

San Francisco __________ has a population of fewer than one million
横线里填写句子 使得该句子成为一个定语从句

i'll show you how to do it when i get back ____San Francisco
介词

How does David get _______San Francisco _______Beijing?Do you know?A.from;to B.to;from C.to;to D.from;from

San Francisco, a leader in urban recycling, is preparing to turn dog waste into energy. Norcal Waste System Inc., the city’s largest garbage company, plans to test collection carts(回收车)and collection bags in a city-center park which is popular with dog walkers. A city study found that almost 4 percent of all the garbage picked up at San Francisco homes was from animal waste, Norcal Waste spokesman Robert Reid said. San Francisco has about 120,000 dogs. “The city asked us to start a program to recycle dog waste in order to cut back adding more waste in landfills(废渣埋填池) “,Reid said. Dog waste will be poured into a methane digester(沼气池),and the methane it gives off will be collected and burned to make electricity or to heat homes. “Dogs and cats in the United States produce about 10 million tons of waste a year,” Will Brinton, an environmental scientist said. “As much as we love them, our pets leave a lot of fertilizer behind them in yards and on the street but that can be a major source of contamination of groundwater,” Brinton said. European cities such as Zurich, Frankfurt, Munich and Vienna are starting biology programs to turn waste into gas ,he said. San Francisco runs a great program to recycle bottles, cars, paper and other rubbish and now two-thirds of its garbage needn’t be carried to landfills .The city’s goal is a 75 percent drop by 2010 and zero new waste in landfills by 2020. 小题1:San Francisco will plan to use dog waste for making __________. A．fertilizer B．gas C．electricity D．methane 小题2:What does the underlined word “ contamination” mean? A．Increase B．Reduction C．Flow D．Pollution 小题3:What can we infer from the passage? A．San Francisco is short of electricity B．San Francisco has done a lot of in rubbish recycling. C．Fewer people will keep dogs as pets in San Francisco D．There will be no rubbish by 2010 in San Francisco 小题4:The passage is mainly about_______. A．San Francisco ‘s new policy for pet keepers B．San Francisco ‘s new plan for recycling C．how to keep a city clean D．how to deal with rubbish

英语短文填空`急 请高手帮助!
A big quarrel broke out in San Francisco in the 1920's.The boats that c______ people a______ San Francisco Bay were too crowded.
Many people had an i i______.
They said that a b______ should be built.S______ people called it
“The bridge That Couldn't Be Built”.
Joseph B.Strauss,a world-famous bridge builder,said,"I t______ it can be built.”Finally,work was started.One worker said,"I f______ the earth shaking when I was up om top.We didn't think it would ever make it.We thought the bridge would f______ into the water.”
It d_______ fall.The bridge was put up and it has become the most f______bridge in America-the Golden Gate Bridge.
每个空已给出开头字母!
请回答后告诉我短文的意思!3Q!