患者女，54岁。脑梗死第三天，意识不清，血压170／100mmHg，左侧偏瘫，颅压高

下列可用于验证铜、铁、锌三种金属的活动性强弱的一组药品是

①Cu、Zn、FeSO₄溶液              ②Cu、Fe、ZnSO₄溶液 

③Cu、FeSO₄溶液、ZnSO₄溶液      ④Fe、CuSO₄溶液、ZnSO₄溶液

A．①②

B．①④

C．②③

D．③④

食品着色剂、食品香料等食品添加剂，在规定范围内使用是安全的，可明显提高食品的感官质量，满足人们不同的需要；而苏丹红、三聚氰胺、瘦肉精根本不是食品添加剂，是违法添加物。食品安全，人人有责。丹丹同学发现妈妈做早餐包子、馒头时，向面团中加入发酵粉，蒸出的包子、馒头中有许多小孔，松软可口，丹丹同学对发酵粉产生了兴趣。

⑴提出问题：发酵粉的主要成分是什么物质？

⑵查阅资料：含钠元素的物质在酒精灯的火焰上灼烧时，会产生黄色火焰。

⑶实验探究：下面是丹丹同学设计的探究实验，请你帮她完成。

①将发酵粉取样，在酒精灯的火焰上灼烧产生黄色火焰。

②取样于试管中，加入稀盐酸，产生大量的气泡，将该气体通入澄清石灰水，澄清的石灰水变浑浊，则发酵粉的主要成分中含有的离子是__________（写离子符号）。

⑷小结与思考：

①发酵粉的主要成分是____________（写化学式）。

②发酵粉与面粉、水混合发酵产生CO₂气体，这些气体会在面团中形成许多小孔，使包子、馒头松软可口。

③实验室制取CO₂可选择下列装置中的__________（填字母序号，任写一组）。

④实验室用A装置制取氧气的化学方程式为_________________。E装置内装满水收集氧气时，还可用于测定氧气的体积，此时还需要_______（填仪器名称），氧气由_____（填“a”或“b”）进入E中。

Last year was the year of the travel deal, with resorts and

airlines practically begging for bookings, and many travelers

finding bargain airfares and hotel rooms as a result．Now the

economy looks as if it might be on a slight rebound．So now is

the perfect time to review your booking strategy（策略）．

Here are 4 simple steps you can take to help cut your travel costs in 2010．

1．Find the Cheapest Dates to Fly

ITASoftware．com, which provides the technological backbone for many airfare shopping sites, allows users to scan an entire month's fares for the least expensive rate．（Log in as a "guest" and click on "month-long search．"） In January, the 28th and 30th were the cheapest dates to fly nonstop to London from New York （$536） for a week's vacation, according to a recent search．The next best was Saturday, Jan．23, at $640．To book the ticket, users must go to another site．Kayak．com has a flexible-dates option （registration is required）and a calendar that shows the best fares found by other Kayak users in the last 48 hours．Bing Travel, the Microsoft search engine, offers a similar option, found under "plan trips," about halfway down the page．

2．Consider Nearby Airports

A recent Web search showed nonstop flights from Los Angeles International Airport to Miami International from $299 round trip on American in early January．But flying into Fort Lauderdale, roughly 30 miles north of Miami, was $219 on Virgin America, an $80 saving．

3．Go Against the Grain

If possible, avoid popular travel dates like holidays and spring break because airlines have begun to charge anywhere from $10 to $30 extra at those times．Farecompare．com offers a handy breakdown of the new fees by date, airline and amount．Early-morning and late-night flights may also be cheaper depending on the route．

4．Make Yourself at Home

For a 6 to 12 percent booking fee, AirBnB/com connects budget travelers with locals who are offering a place to bed down．The Times's Frugal Traveler, Matt Gross, described it as "a cross between CouchSurfing．com and the vacation rentals section of Craigslist．" There were more than 2,000 listings in a recent search for New York including a futon （床垫） in a one-bedroom near Gramercy Park （$65） and a bedroom with private bath and separate entrance in Hell's Kitchen （$150）．

65．According to the first paragraph, ____．

A．the economy in 2010 is surely getting better

B．2009 saw a sharp decrease in travel fees

C．the booking strategies can be put away in 2010

D．in 2009, airlines begged the travelers to buy more travel guides

66．If you want to book a ticket, you may log on to _____．

A．ITASoftware．com                B．CouchSurfing．com

C．AirBnB．com         D．Kayak．com

67．What does "Go Against the Grain" probably mean in the passage?

A．Going travelling in the off-season．

B．Going travelling without taking any grain．

C．Going travelling during holidays and spring break．

D．Going travelling without meals served on early-morning and late-night flights．

68．The passage is most probably taken from ____．

A．a book review         B．a magazine 

C．a website            D．a story book

A professor of economic and history at Atlanta University, W.E.B. Du Bois, promoted full racial equality.

A．economy

B．economics

C．economical

D．economic

A beautiful young woman stopped a taxi in a big square and said to the driver, "Do you see that young man at the other side of the square" "Yes," said the driver. The young man was standing outside a restaurant and looking at his watch every few seconds. "Take me over there," said the young woman. There were a lot of cars, buses and trucks in the square, so the taxi driver asked, "Are you afraid to cross the street" "Oh, no." said the young woman. "But I said I would meet that young man for lunch at one o’clock, and it is now a quarter to two. If I arrive in a taxi, it will at least seem that I have tried not to be too late.\

Which of the following is true
A. The young man waited for a long time.
B. The young woman did not want to see the young man.
C. Something was wrong with the young man’s watch.