A Swiss airplane powered only by energy from the sun left from Abu Dhabi early on January 9, 2019. Its creators hope the plane will make the first around-the-world journey without any fuel. The plane is called Solar Impulse 2. It has one seat and is made from carbon fiber. The plane weighs only as much as a car but its wings are wider than a Boeing 747. The plane's wings stretch 72 meters across. Those wings include 17,000 solar units, or cells, which capture the sun's energy. The energy allows the plane to fly day and night.

　　Two Swiss scientists built the plane. Bertrand Piccard is also an explorer who made the first non-stop flight around the world in a balloon. Andre Borschberg is an engineer and trained fighter pilot. The scientists say they are not trying to alter the airplane industry. Instead, they want to show that new energy sources and technologies can achieve what some say is impossible."We want to show we can fly day and night in an aircraft without a drop of fUel." Mr_ Piccard said.

　　Some parts of the trip will require the pilots to be in the tiny plane for five to six days and nights in a row. So it is good that the pilot's seat is also a toilet.

　　The plane's route begins in the United Arab Emirates. The pilots also plan stops in Oman, India, and China. They will cross the Pacific Ocean, stop in the United States, and continue over southern Europe or North Africa. They plan to arrive back in the United Arab Emirates in late May or early June.

　　Internet viewers can go to the Solar Impulse website to see the plane's location and listen to broadcasts from the pilots.

18. Why does the plane have wider wings?

A. It can fly faster and land safely. B. It will make the plane appear larger.

　　C. It may look like a Boeing 747. D. It can get the sun's energy easily.

19. What does the underlined word "alter" in paragraph 2 probably mean?

　　A. Improve. B. Change.

20. What do we know about the trip mentioned in the text?

　　A. It will take seventy to eighty days and nights.

　　C. It is broadcast live on the Internet.

21. What does the text mainly talk about?

　　A. A newly-built plane consuming no energy.

　　B. A solar-powered plane travelling the globe.

C. A newly-invented plane capturing the sun's energy.

D. Solar energy being fully applied to the airplane industry.

　　There is a saying that "all plans are useless, but planning is vital." Plans are useless as they become out of date very quickly. But without the process of planning, you won't prepare for the future. You need to plan, but don't stick to your plans so rigidly that you miss opportunities.

Life is unpredictable, so why plan? First, all of the things you want to achieve in your life require effort and preparation. You need to ensure you acquire the qualifications and experience that will allow you to progress in your chosen career, and to do that, you need a plan. Having a plan gives you a framework against which to measure your progress. Have you achieved what you set out to do? If not, why not? What can you learn from your successes and failures? A plan also provides a