It is generally believed that we are getting cleaned when we step under a shower. We are, but we’re also giving a home to lots of tiny little creatures we didn’t even know about. A showerhead carries thousands of bacteria called Mycobacterium．These can cause problems like coughs and tiredness, and a general feeling of poorliness (身体不舒服). When you turn on the water, the bacteria go from the showerhead onto and into your body.

??? This is a finding of Norman R. Pace and his team at the University of Colorado, in the US. The scientists investigated bacteria in all kinds of human environment, including showers．Pace's team looked at 45 showerheads in nine American cities. They discovered that 30 percent of them had large amounts of flying Mycobacterium.

But Pace said that they pose few threats to the health．Only those with a weak immune system might need to worry．He told the New York Times that the bacteria are not as unpleasant as might be thought．He said that having a shower is no more dangerous than anything else we do in the morning．

But for those who feel sick about the idea of all those microorganisms (微生物), he had some advice. Let the water run for 30 seconds before getting into the shower. Why? The number of bacteria is smaller than that when the water is just turned on. If that seems like a waste of water, he added that you could also change your showerhead every few months.

??? However, Pace had good news too. He has also been testing the air in US subways. Apart from iron particles (粒子), which are ground off the track by the wheels of trains, subway air is fresh. The reason is that a train’s movement pumps fresh outdoor air into the tunnels.

??? Pace explained that he wanted to understand the natural microbial environments of public places. This kind of knowledge might help discover the microbes to be used in a bioterrorist (生物恐怖分子) attack.

1.From the finding of Norman R. Pace, after taking a shower, we might cough or feel tired because?????? .

A. it’s easy to get a cold when taking a bath

B. the showerhead carries many bacteria causing illness

C. we don’t get cleaned while showering

D. we don’t get a weak immune system

2.According to the passage, which of the following is TRUE?

A. Hot water could kill most of bacteria in showerheads.

B. Of 45 showerheads surveyed in nine cities, 30 carried large amounts of Mycobacterium.

C. Changing showerheads is the only way to avoid microorganisms.

D. Shower water contains much less bacteria after being left to run for 30 seconds.

3.We can learn from the third paragraph that ????? .

A. having a shower in the morning is more dangerous than at other time

B. the bacteria always threat people’s health

C. there is no reason to fear microorganisms for people with strong immune system

D. it is better to do some exercise in the morning than have a shower

4.The underlined word “pose” in the third paragraph probably means “______”．

A. cause     ?????????? B. avoid       ????????? C. describe ????????? D. promise

5.What contributes to fresh air in US subways?

A. The train’s movement.         ???????????????? B. Iron particles．

C. Train wheels. ???????????????????????????? D. Air conditioners on the trains．

First lady Michelle Obama turns 50 on Friday, Jan. 17, 2014.

Michelle Obama has spent the first half-century of her life breaking barriers and checking off a series of firsts. Now, as she reaches her milestone birthday Friday, the nation will be watching to see in what other areas she will leave her mark.

Five years after moving into the White House, and without a re-election campaign to worry about, she has more room to relax in her role and, political watchers say, possibly become more vocal (声音的) on political issues in the three years left in office.

So far, critics have complained about Michelle’s silence on issues where they expected to hear her voice: Last year, at the start of her husband's second term, she disappointed advocates for tighter gun-control measures after she failed to push harder on the issue in response to the massacre (残杀) at Sandy Hook Elementary School in Newtown, Conn. She also disappointed some feminists (女权主义者) who wanted her to defend their causes instead of falling back on her self-described role as the nation’s “mom-in-chief.” Nor did she handle racial issues during her second term, as some had expected.

“The most important thing to remember is, whether you are black, white or Hispanic, you’re the first lady and the president of all the people in the United States. That’s a huge melting pot, so to reinforce (强化)that she's African American over anything else would not be wise,” said Anita McBride, who directs programming and national conferences on the legacies (遗产) of America’s first ladies and their historical influence at American University.

Valerie Jarrett, a top White House adviser and a close friend of the Obamas, said the first lady doesn't want to “spread herself too thin.”

“She really wants to have a maximum impact and to do that in fewer areas,” Jarrett told the Associated Press. “That, she said, “is better than trying to take on every single possible cause.”

But Robert Watson, a Lynn University professor, said he expects Obama to “go a little harder at issues” over the next several years. “Second-term first ladies usually feel more at ease to speak more forcefully about issues close to their heart,” he said.

Myra Gutin, a Ryder University communications professor and frequent lecturer on first ladies, said she expects Obama to continue making both of them a priority in her remaining years in the White House, given their success. Michelle launched the “Let’s Move” campaign in 2010. It in particular has gained widespread support, ranging from the National Football League to the Sesame Street franchise (特许), which even gave permission to the produce industry to use its licensed characters for free on fruits and vegetables.

“There’s no such thing as a traditional first lady, not anymore in this technology-filled world. Is Mrs. Obama cutting edge? Is she an activist? No. As first ladies go, I think she’s been politically careful because she does not want there to be a major flare-up that would require her husband to use his political capital to clean up,” she said. “But she’s not exactly just sitting in the White House pouring tea and having receptions, either.”

1.Critics were disappointed with Michelle because _______.

A. she didn’t put gun-control measures into effect

B. she failed some feminists to stand out to be a career woman

C. she didn’t solve some racial problems

D. she failed to voice her opinion on some issues

2.According to the professors or advisers, which of the following statements is NOT true?

A. It’s not wise to reinforce Michelle is African American over anything else.

B. It’s better for Michelle to have a maximum impact than to take on every possible cause.

C. It's expected for Michelle to go a little harder at issues.

D. It’s a tradition for first ladies to stay out of political issues.

3.What does the underlined phrase “spread herself too thin” in Paragraph 6 mean?

A. Try to do a lot of work at the same time.

B. Get very tired.

C. Try to improve physical fitness.

D. Move herself away from others.

4.In Paragraph 9, the campaign “Let’s Move” might be aiming to help people _______..

a. gain widespread support

b. become more physically active

c. have access to healthier foods

d. raise awareness about gun control

A. a, c        B. a, b        C. b, c        D. c, d

   Most of us think that when we step under a shower we’re getting clean．We are, but we’re also giving a home to lots of tiny little creatures we didn’t even know about．

   A showerhead carries thousands of bacteria (细菌) called Mycobacterium．These can cause problems like coughs and tiredness, and a general feeling of poorliness (身体不舒服)．When you turn on the water, the bacteria go from the showerhead onto and into your body．

   This is a finding of Norman R．Pace and his team at the University of Colorado, in the US．The scientists investigated bacteria in all kinds of human environment, including showers．

   Pace's team looked at 45 showerheads in nine American cities．They discovered that 30 percent of them had large amounts of flying Mycobacterium．

   But Pace said that they pose few threats to the health．Only those with a frail (脆弱的) immune (免疫的) system might need to worry．

   He told the New York Times that the bactertia are not as unpleasant as might be thought．He said that having a shower is no more dangerous than anything else we do in the morning．

   But for those who feel sick about the idea of all those microorganisms (微生物), he had some advice．

   Let the water run for 30 seconds before getting into the shower．Why? The number of bacteria is smaller than when the water is just turned on．If that seems like a waste of water, he added that you could also change your showerhead every few months．

   But Pace had good news too．He has also been testing the air in US subways．Apart from iron particles (粒子), which are ground off the track by the wheels of trains, subway air is fresh．The reason is that a train’s movement pumps fresh outdoor air into the tunnels(隧道)．

   Pace explained that he wanted to understand the natural microbial(微生物的) environments of public places．This kind of knowledge might help detect the microbes to be used in a bioterrorist (生物恐怖分子) attack．

49．According to the finding of Norman R．Pace, after taking a shower, we might ______．

       A．get much dirtier                 B．be covered by bacteria

       C．get a frail immune system      D．catch a cough or feel tired

50．Pace’s research into showers shows that ______．

       A．there is no reason to fear microorganism

       B．shower water contains much less bacteria after being left to run for 30 second

       C．having a shower in the morning is more dangerous than at other time

       D．of 45 showerheads surveyed in nine cities, 30 carried large amounts of Mycobacterium

51．According to the research of Pace’s team, which of the following contributes to fresh air in US subways?

       A．Train wheels．                B．Iron particles．

       C．The movement of the trains． D．Air conditioners on the trains．

52．The word “detect” in the last paragraph probably means “______”．

       A．to discover      B．to protect        C．to make   D．to prevent

Back those photos up

The images were striking．Homes on the East Coast were washed away by Superstorm Sandy. People were in tears, picking up faded photographs, among their only remaining possessions．

If that doesn't move you to get serious about safekeeping your lifetime of memories, what will? The digital age offers tools never imaginable before—including one-click access to a lifetime of family photos．

Here is a brochure (手册) on how to back up (存) your photos and save them online, where they can live forever and be accessible in good times and bad．

Scanning

The first step for those old photos is to scan them and save them to a digital format (格式)．Most，printers come with scanners these days, so that's an easy but extremely time-consuming step．

Storing the photos

With your scans in place, import the photos into your computer, and back them up．

You could make multiple copies of the disks and spread them to loved ones．Or you could choose external (外接的) hard drives or USB thumb drive, and add your photo and video collection from your computer．

Online backup

If you need lots of space, look at a pure online backup service, Caronite．

Caronite backs up 300 million files daily．Once you sign up, it starts to pick up everything you have on your hard drive．But photo collection on your computer's main hard drive charges for $ 59 a year．

Cloud Storage

For folks who don't need automatic backup, but instead want to take a more active approach, Dropbox, Google Drive and Microsoft's SkyDrive let you store files online by yourself, share and instantly access them．All offer free options—2GB of free storage for Dropbox, 5GB for Google and 7GB for SkyDrive．But if you want more, you need to pay．

Bottom Line

The hard drive or flash drive is the cheapest and easiest．But drives can fail．Online services are more expensive, but more secure．With more of us switching back and forth between our computers, such services are the best way to get access to our data from wherever we are．

1.What can we know from the passage?

A．Scanning photos takes little time but costs a lot．

B．The hard drive or flash drive is the cheapest and safest．

C．Google Drive offers unlimited free photo storage on line．

D．Caronite charges for backing up photos from hard drive．

2.Which of the following allows storing files automatically?

A．Caronite．        B．Dropbox．        C．SkyDrive．        D．Flash drive.

3.The main purpose of the passage is to ______．

A．tell real stories about storage services

B．introduce some of the storage services

C．describe the functions of storage services

D．argue about the advantage of storage services

Shopping in the United States changes a lot．About ninety years ago most people shopped in small stores that were owned by one person or a family．Women went from the bakery to the butcher's to the grocer and on to the fruit and vegetable seller in order to get their food for the week．

       Then about sixty years ago, supermarkets were born．In a supermarket, people could get all the different kinds of food they needed without going to different stores．

       The next big change in shopping in the United States was the shopping mall．A shopping mall is a group of stores under one roof．Because malls allowed people to shop without worrying about the weather, they soon became very popular．The mall became a place for people to socialize in addition to shopping．If you walk through a mall, you will see older people sitting, chatting and drinking coffee．Malls are places for teenagers to hang out．Many teens will often just "go to the mall" and spend time with their friends．

       The recent change in American shopping was the superstore．Large chain stores such as Wal-Mart, Office Depot and Toys "R" Us have been built all across the United States．Because they are so large, they can buy goods at a great discount and sell them much cheaper than smaller stores．

       Sometimes, when they are built near small towns, many of the small town stores have to close．They just cannot compete with their giant neighbors．

       And now, online shopping is becoming more and more popular all over the States．People are too busy to go to the physical stores, so they go shopping over the Internet．Online shopping has lots of advantages．For instance, online stores are usually available 24 hours a day．Searching or browsing online shops can be faster than browsing the physical stores．While, online shopping also has its disadvantages．People are at higher risk of being cheated on the part of the merchant than in a physical store．And privacy of personal information may be let out．

Which of the following shows the right order of shopping development in the United States?

       ①small stores ②superstores  ③shopping malls   ④shopping online

       ⑤supermarkets

       A．①②③④⑤         B．①⑤②③④

       C．①⑤③②④      D．②③④①⑤

Which is the place for people to spend time with others according to the passage?

       A．Shopping malls．      B.  Small stores．   

       C．Supermarkets．           D.  Superstores．

Why can the superstores sell products at much lower prices?

A．Because they are built near small towns．

       B．Because they are across the United States．

       C．Because they sell all kinds of products people need．

       D．Because they can buy goods at a reduction in the price．

What's the disadvantage of online shopping according to the passage?

       A．Wasting time．          B．Leaking personal information．

       C．Fixed prices．          D．No chance to do physical activities.