Fed up with constantly having to recharge or replace batteries in your ever-expanding electronic devices? The solution may be just a few steps away. "Energy harvesting" promises to power countless consumer devices, often with nothing more than your body's movement or heat. Dozens of companies around the world already offer such products, but many experts believe the market for the technology could explode due to electronic devices being developed for the Internet of Things. "It's huge," said Graham Martin, CEO of the EnOcean Alliance, a San Ramon-based group of businesses that promotes wireless energy-harvesting technologies. With the Internet of Things expected to combine billions of devices, "if they are all battery-powered, we'll have a problem because there's not enough lithium in the world," he added. "So a lot of them will have to use energy harvesting." Among the most basic forms of the technology is body power. When certain materials are squeezed or stretched, the movement of their atoms creates an electrical charge. Automatic watches have employed the concept for decades, for example, by winding themselves when their user moves their arm. Now, the concept is being considered for a number of other devices. In a contest seeking visionary ideas for wearable technologies, Intel awarded $5,000 for a concept to change the temperature difference between a person's body and a special piece of clothing they'd wear into electricity for mobile devices. Using sound to power devices is another energy-harvesting variation. Stanford University engineers are testing smart microchips that create electricity from ultrasound to power implantable devices that can analyze a person's nervous system or treat their diseases. A textile research association in Spain is proposing to obtain electricity from radio waves that flow around everyone to power sensors sewn into clothes, which can monitor a person's heartbeat or other vital signs. Research firm IDTechEx has estimated that annual global sales of... It can be learned from the passage that _ . A) energy-harvesting products save money in the long run B) taller people can surely produce a larger amount of power C) automatic watches harvest energy from the users' body heat D) two ways of harvesting energy are mentioned in the passage
A
(Question)
No matter who you are or where you come from, one thing is certain: you are familiar to the mosquito, although you probably wish you weren't. Mosquitoes are everywhere. They can be found all over the world, and they come in more than 2,500 species . Somewhere, at some time, you have surely met at least one. No one loves the mosquito. But unfortunately, the mosquito may decide who she loves. She? Yes, she. Do you know that only the female mosquito bites? Well, it's true. And it's not because she is unfriendly; she needs blood to reproduce. Do you know how the female mosquito decides whom to bite? She is quite selective, and she chooses her victims carefully. First, she uses sensors to find her victim. These sensors are located on her two antennae and her three pairs of legs. With these sensors, she tests your body moisture, body warmth, and chemical substances in your sweat. If she likes what she finds, she bites. But if you are not attractive, she'll reject you for another one. The next time a mosquito bites you, just remember that you are chosen. You are special. If the mosquito likes you, she settles onto your flesh very gently, and she breaks your skin with her long nose tip. Long nose tip? What's that? It's a kind of mouth and it sticks out just below the mosquito's eyes. It contains six sharp instruments called styles. She thrusts all six styles into your skin at once, and if she hits a blood pipe, she'll get a full dinner in about a minute. All this usually takes place so quickly and quietly that you may not have doubted anything is happening. Why does a mosquito bite itch ? The itch is not really from the bite. lt's from the saliva the mosquito mixes with your blood to keep it from being blocked as she sucks up her long nose tip. By the time the itch begins, she has gone. And then what happens? Well after her delicious dinner, the mosquito is tired. She just wants to find a place to rest. Heavy with your blood, she picks a spot on a leaf, a wall or a stone to quietly lay her eggs. Just one drop of... The female mosquito looks for you because she _ . A) is thirsty for your blood B) needs blood to reproduce C) loses her heart to you D) feels hungry at the time
(Answer)
B
Ques: Fresher's Week at universities can be a nervous experience. The prefix = st1 /UKhas a well-respected higher education system and some of the top universities and research institutions in the world. But to those who are new to it all, it can be confusing. October is usually the busiest month in the academic calendar . Universities have something called Freshers' Week for their newcomers. It's a great opportunity to make new friends, join lots of clubs and settle into university life. However, having just left the comfort of home and all your friends behind, the possibility of meeting lots of strangers in big halls can make you nervous. Where do you start? Who should you make friends with? Which clubs should you join? Luckily, there will be thousands of others in the same boat as you are worrying about starting their university social life on the right foot. So just take it all in slowly. Don't rush into anything that you'll regret for the next three years. Here are some top tips from past students on how to survive Freshers' Week: ---Blend in. Make sure you are aware of British social etiquette . Have a few wine glasses and snacks handy for your housemates and friends. --- Be _ . Sometimes cups of tea or even slices of bread can give you a nice start in making friends. ---Be sociable. The more active you are, the more likely you'll be to meet new people than if you're someone who never leaves their room. ---Bring a doorstop. Keep your door open when you're in and that sends positive messages to your neighbours that you're friendly. So with a bit of clever planning, Freshers' Week can give you a great start to your university life and soon you'll be passing on your wisdom to next year's newcomers. The advantages of Freshers' Week include the following EXCEPT _ . A) You may have better understanding of choosing friends. B) You will have a good beginning of your university life C) You can have nice scores D) You may be more popular
Ans: C
Is been a dream for 30 years but now the world's first flying car is set to hit the roads this year. Ever since the"Back to the Future"movies lit up our screens in the 1980s,designers have dreamt of cars that could take to the sky at the push of a button. And now pilots can order their own "roadable"plane for just PS 127,000. The plane,which has fold-out wings that span 17. 5 ft,has a range of flying distance of 460 miles and can be up to 115 mph. Back on the land,it can also travel at"highway speeds" in car mode . Fuelling the 19 ft long plane couldn't be simpler--you just drive it into a petrol station and fill it up. A spokeswoman said,"You can keep you 'light-sport airplane'in your garage. But because _ needs a short runway to take to the air,you will have to drive to your local airport,fly up to 460 miles,land,and drive directly to your destination. You will always be ready to drive or fly. " The spokeswoman added,"Never let bad weather change your trip. You call simply divert and continue on the ground until the weather clears. " There's no risk to you--This is only the chance for you to be the first at your home field to unfold your wings and fly into the future. If you meet with a thunderstorm in your"roadable"plane in the skies,you can_. A) 1and in a nearby airport until it clears B) turn back home until it clears C) 1and and drive on the ground D) fly high up to 460 miles
C