—Mary, leave today’s newspaper on the table, please. I________it yet.

—OK, Dad.

A.won’t read B.am not reading C.haven’t read D.was not reading

If the lake continues to be protected, ________more fish in it over the next several years.

A.there are B.there will be C.there were D.there have been

Tony and I________table tennis once a week. He plays better than I do.

A.play B.will play C.played D.have played

—Excuse me, can we check in now?

—Just a moment please. I________a problem of our computer.

A.fix B.fixed C.am fixing D.have fixed

Since a new road________two years ago, this village has developed very fast.

A.builds B.built C.is built D.was built

—Could you tell me________?

—At six o’clock tomorrow afternoon.

A.when we will start training B.when will we start training

C.where we will start training D.where will we start training

When a Man Made Fun of His Seatmate

Soon after Savannah Phillips, a 33-year-old mother, sat down in her window seat on a United Airlines flight this past May, she glanced（瞥见）over at her seatmate. He was busy ___________. His phone was not far from her face and the letters were unusually _________, making it easy for Phillips to read the message on it: “Hey Babe, I’m sitting next to a smelly fatty.”

Tears streamed down the poor woman’s face as she tried to hide herself to the corner, trying to make herself as _________as possible.

“It awoke all the unpleasant things I think about myself. I always preferred to sit alone on flights because of my _________, fearing others next to me would feel uncomfortable. ” Phillips wrote in a Facebook post after the flight.

Sitting a row behind them was Chase Irwin, a 35-year-old bar manager. He could see Phillips crying—and then he oversaw the man’s texts.“I could not have this guy,who’s making fun of her, sit next to her this whole flight,” he said in an interview later.

_________, Irwin unlocked his seat belt and went over to the texter. “Hey, I need to talk to you,” Irwin said. “We’re switching（交换）seats—now.” When the texter asked why, he said, “You’re texting about her, and I’m not putting up with that.”

The texter quickly _________. Irwin took his place next to Phillips and was soon cheering up his new seatmate.

“He ___________me not to let that guy get to me and that everything was going to be fine,” Phillips wrote. They spent the rest of the flight chatting like friends.

With her trust in humanity restored, Phillips wrote this on Facebook: “I was so grateful（感激的）he was there. What he did set such a good_______for others to follow, that is, sticking up for people when they need help.”

1.A.texting B.talking C.playing D.working

2.A.beautiful B.large C.discouraging D.surprising

3.A.warm B.brave C.small D.light

4.A.build B.face C.manner D.character

5.A.Probably B.Fortunately C.Successfully D.Immediately

6.A.promised B.remained C.agreed D.insisted

7.A.encouraged B.ordered C.warned D.trained

8.A.goal B.example C.task D.time

Cool Places to Visit In the World

1.The world’s highest bridge is in________.

A.China B.Sweden C.Canada D.Denmark

2.Which of the four places is a power plant?

A.Icehotel. B.Beipanjiang Bridge.

C.CopenHill. D.Canada’s Wonderland.

3.What makes Canada’s Wonderland a cool place to visit?

A.A 1,300-foot man-made ski slope. B.Works of art made of ice and snow.

C.A wonderful view of Beipanjiang Canyon. D.The world’s fastest and longest dive coaster.

Luisa’s Letter

Luisa checked the mailbox. An eggshell-white envelope lay on top of all the letters. It was still there, thank goodness. She picked it and put it into her bag.

Upstairs, she handed the remaining letters to her mother. “How was school, Luisa?” Mom asked.

“It was fine,” said Luisa, giving her mother a quick hug.

In her room Luisa tried to focus on her English homework, but the letter called to her. It had traveled more places than she had. All her life, Luisa had lived in Seville, an ancient city in the southwest of Spain. Luisa loved her hometown, but she wanted to see the world.

A year abroad! What an attractive possibility! But Luisa couldn’t bring herself to raise the subject with her parents because her parents just wanted her to stay in Seville, get married, give them grandchildren. Last spring, on her own, she applied for(申请) a year of high school in England. Now, this envelope held her answer.

Luisa went to the kitchen to help with dinner. She asked, “Mom, do you ever think about traveling?

I mean, I want to. And maybe someday…live somewhere else.”

Luisa’s heart beat harder as she waited for her mother’s reaction. But Mom nodded. “Luisa, of course you’d like to travel. I want that for you and…”

Just then Dad arrived. When they sat down at the table to eat, Dad said, “Seville is the best, yes, my Luisa?” Luisa’s heart sank(为之一沉). Dad continued, “Why would people want to leave Seville?” Mom smiled, “When Luisa is old enough, we can discuss with her what’s best for her future.”

Dad raised an eyebrow but didn’t argue.

Luisa couldn’t wait any longer, but her parents’ easy chatter(聊天)was the sound of her childhood. She sank deeper into her chair and listened. Home would always be here. But when the time was right, she’d leave. And she wanted it to be with her parents’ support.

“Something came in the letter,” she said at last. “I want you to see.” She took out the letter. “I’m sorry I didn’t tell you,” her voice was shaking. “I wanted this more than anything.” Luisa waved at the unopened envelope. “But only if you say it’s okay.”

1.Last spring, Luisa________.

A.traveled abroad with her parents B.got married and started a family

C.discussed her future plan with her mother D.applied for a year of high school in England

2.How did Luisa feel as she waited for her mother’s reaction in the kitchen?

A.Excited. B.Nervous. C.Proud. D.Regretful.

3.Luisa decided to tell her parents about the letter because________.

A.she wanted her parents’ support B.she had already known the answer

C.her parents asked her for the letter D.her parents were unwilling to wait

Bacterial Quorum Sensing

Bacteria(细菌)play an important role in our lives. They can keep us alive as well as make us sick. It wasn’t until fairly recently that we learned bacteria can communicate with one another.

In the 1960s, researchers found that a kind of bacteria called Vibrio fischeri（费氏弧菌） produced no light when they were alone, but that they exhibited great amount of light as the bacterial population grew to a certain number. How did this happen? How can Vibrio fischeri tell the difference between times when they’re alone and times when they’re in a community, and then all do something together?

Researchers found they talk to each other with a chemical language—signal molecules(信号分子). Vibrio fischeri makes signal molecules, and it also has a receptor on its surface that fits like a lock and key with a signal molecule. As the bacteria increase, more and more signal molecules are sent into the environment. When signal molecules increase to a certain amount, they lock down into those receptors and information comes into the bacteria, which tells them how many neighbors there are. As soon as they realize the population has hit the certain number, all of the bacteria behave as a group, making light together. In the past ten years, researchers have found all bacteria have systems like this: they make and recognize chemical words, determine(判断)the size of the community, and carry out tasks that would be unsuccessful if a single one were to act alone. This process is called quorum sensing.

Most of the time, bacteria live with thousands of other species (种类)of bacteria. There has to be a language of interspecies communication. In fact, bacteria have another kind of signal molecule, which is the common language used by all species. Moreover, this kind of molecule has its own receptor. In this way, bacteria are able to count different populations, and then they decide what task to carry out depending on which species has the greatest population.

Knowing how bacteria communicate could influence how we fight disease. What if bacteria can’t talk or hear? They won’t recognize when there are enough bacteria and when to exhibit the group behavior to make us sick. Researchers are developing a method—to make molecules that look like the real ones and then they lock into the receptors to jam recognition of the real situation.

On the other hand, researchers also improve the conversation of the beneficial bacteria, so they can do things that we want them to do better than they would do on their own.

1.According to the passage, what can we learn about quorum sensing?

A.Quorum sensing may happen when there is only one Vibrio fischeri.

B.Signal molecules are kept away from receptors during quorum sensing.

C.Most bacteria have similar systems to make light during quorum sensing.

D.Bacteria carry out a group task when their population hit a certain number.

2.What can we learn from the passage?

A.The more species there are, the more group actions bacteria will take.

B.In different environments, bacteria have different interspecies languages.

C.Beneficial bacteria communicate better by themselves than harmful ones.

D.To fight disease, researchers try to turn off the communication between harmful bacteria.

3.The passage is mainly about ________.

A.why bacterial population grows B.how bacteria communicate with each other

C.which bacteria help fight disease D.what scientists do to find quorum sensing