Read the following article and answer the question. Article: Did you hear of the supercomputer? Recently, China's Tianhe-1 was ranked as the world's fastest supercomputer, according to a new list of world's TOP 500 supercomputers. It took 200 Chinese scientists two years to build the fastest supercomputer. It can do 2,507 trillion calculations in a second! That means it will take a personal computer 600 years to finish the work that a supercomputer does in a day! The US now leads the world in the area of supercomputers. It is home to more than half of the world's top 500 supercomputers. Japan also has advanced technology. China is developing its supercomputer technology quickly. But experts say it will take years before China's total computing power can catch up with that of the US. Supercomputers can work on many different things. They can solve problems in areas like national defense , energy and science. In business, you can also use supercomputers. Oil companies use them to find oil and gas. Banks use them for quick trades. Food companies even use supercomputers to make sure that they put potato chips into cans without breaking them. To make a supercomputer, scientists first need to link thousands of small computers together. Then they use software to turn them into one supercomputer. In fact, any person with enough knowledge about computers can make a supercomputer. But you need the top technology to make a supercomputer run fast. Question: Among the world's top 500 supercomputers, _ of them are made in the US. Answer:
OPTIONS:
- less than 20%
- more than 50%
- less than 50%
- more than 20%

Answer: more than 50%

Read the following article and answer the question. Article: Spring cleaning is a tradition in America. People clean up and tidy up their houses in springtime. Before the invention of the electricity ,people used a lot of coal and wood in winter to heat their houses. Those things left behind a lot of dust on everything in the rooms. At that time,people always welcomed spring because when the weather started getting warmer, they could stop using coal and wood and get everything cleaned up. Later spring cleaning became a tradition. Nowadays we don't use coal and wood so at the end of winter our houses are not dirtier than they were in the past. People don't need to remove a lot of dust.However, they have a new problem--- _ . Today the spring cleaning for most family is mainly about tidying up some useless things at home. Truly, the importance of the tradition of spring cleaning today is different from it was in the past, but it is as important as it was in the past . Now, in springtime,people clean up their houses, yards and gardens. At the same time, they spend much time in looking for the things that they don't love any more or they don't use any more. They collect old clothes,old toys, old books and some other useless or old things and then throw away or donate them.This helps people enjoy what they have and their homes more. So people nowadays should not give up this tradition. Always follow the tradition. Question: In the past,during the process of _ ,a lot of dust appeared in people's houses. Answer:
OPTIONS:
- cooking meals
- lighting the rooms
- making electricity
- making the houses warm

Answer: making the houses warm

Read the following article and answer the question. Article: The airport in Boswell is twenty-one miles from the city. The banks and business offices are in the center of the city. Read these notes from the diary by Mr. Reg Simpson: March 2004 15 MON Group of 35 French students visiting Boswell -- want cheap holiday 16 TUES Mr. and Mrs. J. Grant arriving from Paris -- only stay a night at Boswell -- leaving early on the 18thby air 17 WED Mr. Nagashima, Tokyo, arriving for a two-day business trip 18 THUR 65 Russian students need two days in a cheap hotel 19 FRI have a group meeting about how to attract travelers from Asia 20 SAT Mr. and Mrs. Johnson, from Washington D.C., arriving by air 21 SUN Dinner with Bella at King Garden and watch King Kong at 9:00 p.m. 22 MON Mr. and Mrs. F. Ray, need cheap hotels for two days Question: Mr. Reg Simpson is probably _ . Answer:
OPTIONS:
- a headmaster
- a travel manager
- a traveler
- an engineer

Answer:
a travel manager