【推荐1】Since the earliest times, people have looked up at the stars, the moon and the planets. Today people use modern machines ________ at the sky. This is very different from the situation ________ years ago when people could only use their eyes. Perhaps they dreamed of ________ the universe. When did humans first go into space? The story began not so long ago, ________ the first astronauts were not people—they were animals.

Scientists wanted to make traveling to space as ________ as possible for humans. So they decided to experiment（试验） with animals and test them in spaceflights. Insects, mice, frogs, dogs and monkeys were some of the animals that first went into space. Many of them ________, but they helped to make space travel safer for humans. For their great service, we ________ forget these animals.

Albert II was the first monkey to go into space in 1949. Sadly he died ________ his spaceship landed back on the earth.

Luckily, the result was different for Ham the monkey. His story ended happily when he returned to the earth ________ very good health.

Scientists wanted to know the answer to the important question: could an animal like Ham do the same things in space as he could do on the earth? The answer came when Ham was sent into space in 1961. Yes, he did everything well and lived for ________ 16 years.

【推荐2】Artificial intelligence or AI in short, is the science to make computers and machines ________ like humans.

So far, AI scientists and engineers have made a lot of cool technologies. AI is rapidly catching up ________ the human ability ________ faces. As a result, facial recognition ________ a lot in the world. Chinese police use this technology to identify criminal . Once they caught a criminal when he attended ________ concert. ________ also checks the ID of ride-hailing (网约车) drivers and lets people pay for things with a smile.

AI is also used in self-driving cars ________ are believed to be the future of driving. Most drivers may wave or nod at passers-by to let them cross the street, ________ self-driving cars don’t have this ability. Carmakers are testing a light signal system ________ them “speak” to humans. The system can show ________ self-driving cars will do. For example, if a driverless car is yielding (让路), it will flash two white lights side to side. A rapidly flashing light tells passers-by ________ the car is about to speed up.

Service Robots also show you how ________ AI is. ________ that you come back home from school and your robot housekeeper is waiting for you at the door. After dinner, he teaches you to play the piano, just like a real music teacher. Such thoughts soon ________ in the real world. In the future, more and more service robots will become good home helpers.

AI is ________ powerful that it can help human beings and even replace us in many jobs.