【题目】根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Secret codes (密码)keep messages private. Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer.

People have used secret codes for thousands of years. 【1】 Code breaking never lags(落后) far behind code making. The science of creating and reading coded messages is called cryptography.

There are three main types of cryptography. 【2】 For example, the first letters of My elephant eats too many eels spell out the hidden message Meet me.

【3】 You might represent each letter with a number, for example. Lets number the letters of the alphabet, in order, from 1 to 26. If we substitute a number for each letter, the message Meet me would read 135 520 135.

A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. 【4】 For example, bridge might stand for meet and out might stand for me. The message Bridge out would actually mean Meet me. 【5】 However, it is also hard to keep a code book secret for long. So codes must be changed frequently.

A. It is very hard to break a code without the code book.

B. In any language, some letters are used more than others.

C. Only people who know the keyword can read the message.

D. As long as there have been codes, people have tried to break them.

E. You can hide a message by having the first letters of each word spell it out.

F. With a code book, you might write down words that would stand for other words.

G. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.

【题目】Urban swans might be born with a daredevil gene that makes them less fearful of humans, compared with their rural colleagues.

A study has found swans living in cities tend to be bolder and it is at least partly determined by a gene called DRD4. Birds with this gene could therefore be better adapted to settling in more populated areas, while more timid(胆怯的)swans would escape to less inhabited regions.

It could help to explain why swans in public parks and on urban rivers have a reputation for being so aggressive towards humans - they are simply not afraid of us.

Biologists from some universities in Australia, tracked and collected blood samples from black swans living in two wetlands near cities. One group of swans lived in a recreational urban park, while the other occupied a waste-water processing site out of town. The two areas were less than 20 miles apart.Later, from 2011 through 2013, the researchers started systematically scaring the swans at both sites. The researchers approached the birds and calculated how close they could get before they flew away.As expected, they noticed that while rural swans started flying away if a human was closer than 119 meters, the scientists could come as close to urban swans as 39 meters before taking off.

Analyses of the blood samples, in fact, showed that 83 per cent of the less cautious swans presented the same genetic DRD4 variation(变异)while rural swans have different genetic makeups resulting in more wariness(谨慎,小心).

The researchers conclude that swans with the bold variation of the gene might choose to live in urban environments, as they tend to be less bothered by human presence.

1The underlined word in paragraph 1 means__________.

A. timid B. cautious

C. bold D. stubborn

2What’s the difference between rural swans and urban ones?

A. The rural swans carry more DRD4.

B. The urban swans are more friendly.

C. The urban swans are less scared of people.

D. The rural swans are aggressive towards humans.

3What does DRD4 refer to ?

A. a kind of blood. B. a kind of food.

C. a kind of genetic variation. D. a kind of swan.

4What does the 4th paragraph mainly talk about?

A. The living habit of swans.

B. The living environment of swans.

C. The contribution of the biologists.

D. The process and result of the research.

【题目】阅读理解

阅读下列短文,从每题所给的四个选项(A、B、C和D)中选出最佳选项,并在答题卡上将该项涂黑。

You probably know who Marie Curie was,but you may not have heard of Rachel Carson.Of the outstanding ladies listed below,who do you think was the most important woman of the past 100 years?

Jane Addams(1860-1935)

Anyone who has ever been helped by a social worker has Jane Addams to thank. Addams helped the poor and worked for peace. She encouraged a sense of community(社区)by creating shelters and promoting education and services for people in need. In 1931,Addams became the first American woman to win the Nobel Peace Prize.

Rachel Carson(1907-1964)

If it werent for Rachel Carson, the environmental movement might not exist today. Her popular 1962 book Silent Spring raised awareness of the dangers of pollution and the harmful effects of chemicals on humans and on the worlds lakes and oceans.

Sandra Day OConnor(1930-present)

When Sandra Day OConnor finished third in her class at Stanford Law School, in 1952,she could not find work at a law firm because she was a woman. She became an Arizona state senator(参议员) and ,in 1981, the first woman to join the U.S. Supreme Court. OConnor gave the deciding vote in many important cases during her 24 years on the top court.

Rosa Parks(1913-2005)

On December 1,1955,in Montgomery, Alabama, Rosa Parks would not give up her seat on a bus to a white passenger. Her simple act landed Parks in prison. But it also set off the Montgomery bus boycott. It lasted for more than a year, and kicked off the civil-rights movement. The only tired I was, was tired of giving in, said Parks.

【1】 What is Jane Addams noted for in history?

A. Her social work.

B. Her teaching skills.

C. Her efforts to win a prize.

D. Her community background.

【2】 What was the reason for OConnors being rejected by the law firm?

A. Her lack of proper training in law.

B. Her little work experience in court.

C. The discrimination against women.

D. The poor financial conditions.

【3】Who made a great contribution to the civil-rights movement in the U.S.?

A. Jane Addams. B. Rachel Carson.

C. Sandra Day OConnor. D. Rosa Park.

【4】What can we infer about the women mentioned in the text?

A. They are highly educated.

B. They are truly creative.

C. They are pioneers.

D. They are peace-lovers.

【题目】Grandparents Answer a Call

As a third-generation native of Brownsville, Texas, Mildred Garza never planned to move away. Even when her daughter and son asked her to move to San Antonio to help with their children, she politely refused. Only after a year of friendly discussion did Ms. Garza finally say yes. That was four years ago. Today all three generations regard the move as a success, giving them a closer relationship than they would have had in separate cities.

No statistics show the number of grandparents like Garza who are moving closer to adult children and grandchildren. Yet there is evidence suggesting that the trend is growing. Even President Obamas mother-in-law, Marian Robinson, has agreed to leave Chicago and move into the White House to help care for her granddaughters. According to a study by grandparents. Com, 83 percent of the people said Mrs. Robinson s decision will influence grandparents in the American family. Two-thirds believe more families will follow the example of Obamas family.

In the 1960s we were all a little wild and couldn’t get away from home far enough for fast enough to prove we could do it on our own,says Christine Crosby, publisher of Grand , a magazine for grandparents.We now realize how important family is and how important it isto be near them, especially when youre raising children.

Moving is not for everyone. Almost every grandparent wants to be with his or her grandchildren and is willing to make sacrifices, but sometimes it is wiser to say no and visit frequently instead. Having your grandchildren far away is hard, especially knowing your adult child is struggling, but giving up the life you know may be harder.

【1】Why was Garzas move a success?

A.It strengthened her family ties.

B.It improved her living conditions.

C.It enabled her to make more friends.

D.It helped her know more new places.

2What was the reaction of the public to Mrs. Robinsons decision?

A.17% expressed their support for it.

BFew people responded sympathetically.

C.83% believed it had a bad influence.

D.The majority thought it was a trend.

3 What did Crosby say about people in the 1960s?

A.They were unsure of themselves.

B.They were eager to raise more children.

C.They wanted to live away from their parents.

DThey had little respect for their grandparents.

4What does the author suggest the grandparents do in the last paragraph?

A. Make decisions in the best interests of their own.

B. Ask their children to pay more visits to them.

C. Sacrifice for their struggling children .

D. Get to know themselves better.

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