When Joshua Blue, a head teacher at the Kennedy, hosts a lecture for his students, he wears a light violet-colored tie. "You don't want so many bright colors that the kids will get distracted," said Blue. Colors give off very specific signals, and different tie colors stand for very different impacts. Wondering what color tie to wear to your next meeting? Here's how to choose the perfect color tie for every occasion:
All powerful reds
It's not a coincidence（巧合）that many politicians wear red-colored ties with light shirts and darker suits. "Red is the powerful color," said Mark Woodman, a trend analyst who studies color in Laurel, Maryland. "There’s something about red that always comes back to strength and passion.” But the tone of your reds matters, too. Darker reds can help build trust, while lighter red and pink ties can be more of a statement about your personal style and be associated with creativity. When you want to convey a sense of ambition, consider a shiny red.
Royal purples
Ross Znavor, an executive in financial services in New York, wears purple ties rather than red to business meetings because the color shows a bit of self-confidence and helps him create lasting first impressions. Purple, traditionally a sign of royalty and wealth is becoming more acceptable in the workplace.
Black affairs
"While you might not wear them to meetings on a regular basis, wearing black ties to a cocktail party or even a dinner is unique and attractive," said Zyla. But remember: the formal black color can feel aggressive in many situations. "Avoid it if you are a green-hand at work," Zyla said.
Right blues
Afraid of sending the wrong message with your tie color? Consider blue as the all-purpose tie. Blue ties are a good investment because the color reminds people of the sky and ocean. "Blue is the safest color to wear," Lindsay said.
【小题1】Why do many politicians prefer red-colored ties?

A．Because they often wear light shirts and darker suits.

B．Because they want to get promoted.

C．Because red is related to strength and passion.

D．Because red gets their message across easily.

【小题2】Who will probably choose the purple ties?

A．Politicians.	B．Businessmen.
C．Artists.	D．Head teachers.

【小题3】What color tie will you consider if you are a green-hand at work?

A．Red.	B．Purple.
C．Black.	D．Blue.

A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.
“It’s extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components. “The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own,” he said.
They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it’s connected to,” said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.
While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers’ fields or on the battlefield. “Basically it should be able to take off, land and fly around,” he said.
Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis.”
【小题1】The difficulty the team of engineers met with while making the robotic fly was that __________.

A．they had no model in their mind

B．they did not have sufficient time

C．they had no ready-made components

D．they could not assemble the components

【小题2】It can be inferred from paragraphs 3 and 4 that the robotic fly __________.

A．consists of a flight device and a control system

B．can just fly in limited areas at the present time

C．can collect information from many sources

D．has been put into wide application

【小题3】Which of the following can be learned from the passage?

A．The robotic flyer is designed to learn about insects.

B．Animals are not allowed in biological experiments.

C．There used to be few ways to study how insects fly.

D．Wood’s design can replace animals in some experiments.

【小题4】Which of the following might be the best title of the passage?

A．Father of Robotic Fly

B．Inspiration from Engineering Science

C．Robotic Fly Imitates Real Life Insect

D．Harvard Breaks Through in Insect Study

短文改错

Some people think that they will get ill if they will use their brains too much. It is not truly. Through many studies，scientists show us that the less you use your brains，the better they will be，but the cleverer you will become. Of course，if you want to keep your mind clear and active，you must take proper rest and study properly. To the teenagers，use their brains in the morning is good for your health.

There are various ways to rest. One of them is a peaceful rest. Sleep is a perfect example. As we all know，lack of sleep can do great damage for our health. Another is an active rest. For example，take a walk outdoors，and do more exercises every day. In everyday life，eating some eggs，meat，fresh vegetables and fruit are also good for the brains.