(Question)
Frogs are animals that can live both in water and on land.There are more than 5.000 kinds of frogs on the earth.The earliest known frogs lived about 190 million years ago and the frogs today still look the same.Here are some fun things that you might not know about frogs.Enjoy! The Biggest and the Smallest Frogs Some frogs can be very big.The biggest kind of frog is the Goliath Frog in West Africa.Its body can be nearly 30cm long,about the size of a large cat.The Gold Frog and the Poison Frog are the smallest frogs in the world.They are less than lem long.Though the Poison Frog is very small,it is not weak at all.It is dangerous.Any animal that eats it will die very soon. The Best Jumpers Frogs are very good at jumping.They developed jumping legs so that they would not be eaten by other large animals.Using their big strong legs,most frogs can jump over 20 times their own length.It is like a person jumping over about 30.48m.The Australian Rocket Frog can even jump over 2m,which is 50 times its body length(5.5cm).That might be the reason why frogs are called the best jumpers on the earth. The Cryogenic Animal Some frogs like the Common Wood Frog have a special ability to live in very cold places.When the temperature goes down,they become ice frogs.2/3 of their body water freezes.Their hearts stop,and their breathing stops too.You may think they are dead,but in fact they are not.Maybe we humanscan learn thc way that the frogs do for medical purpose. The earliest frogs lived about _ million years ago. A) 20 B) 30 C) 50 D) 190
(Answer)
D

(Question)
Do you like traveling? Have you traveled to Los Angeles? Have you traveled to the moon? A rich man plans to live on Mars. Is it the beginning of a science fiction novel? In fact, it happens in the real world. Elon Musk is the founder and CEO of a private spaceflight company. He has said his plan is to live on the planet. He says he plans to live on Mars with a group of fewer than ten people. He will take them on a rocket powered by liquid oxygen and methane . Each one should pay $ 500,000 to fly there. However, these passengers are not going there to travel, but they are going to work. They need to carry tools to build houses and grow crops there. Musk believes one person out of every 100,000 people may be interested in making the journey. Then Mars will have sixty-three thousand people in the future. What will these passengers do on Mars? A) They will learn English there. B) They will make friends there. C) They will go there to travel. D) They will build houses and grow crops there.
(Answer)
D

(Question)
3D printing technology may not be a new thing in some foreign countries. But in May this year, at Shenzhen Convention and Exhibition Center. Many visitors were attracted by a 3D printer. The machine looks similar to an ordinary printer and can print a "statue" in about 90 minutes after scanning anything, including a person. The printer prints layer by layer. For example, if we want to print a 30-cm-tall statue, the computer will calculate* the layers and print 460 layers in total*. It can also print people and clothes. You can stand for scanning for just about three minutes, and a statue will be finished about two hours. The cost for a statue of a man is about 1000yuan. The printer, which costs about 500,000yuan, is from the USA. "We want to introduce this technology to people, and find more chances here." said an engineer, "There is a company in USA that offers 3D printing services to people. Many people come to design their own thing. It is very cool. We hope that the printer will encourage more Chinese people to be more creative." A 3D printer _ . A) is a common machine B) prints layer by layer C) can make clothes and people D) is widely used in Shenzhen
(Answer)
B