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Read the following article and select the best answer. Article: Most people know Alexander Graham Bell invented the telephone. But not many know about another talking device (equipment) he invented just four years later, in 1880. He called the device the photophone. "Photophone" comes form the Greek words for "light" and "sound". The photophone did not use electricity to carry sound over wires between two people. _ . Instead, the photophone used a beam of sunlight traveling through the air. With his invention, Bell could actually transmit human speech on a beam of light. To do so, he spoke close to a thin mirror that was reflecting sunlight. The vibrations of his voice caused the mirror to vibrate, and the vibrating mirror caused the light to vibrate. The vibrating light hit a light-sensitive cell in a receiver placed some distance away. The cell changed the light patterns into electrical signals. Earphones changed the signals back into sounds. Bell believed that his idea of talking on a beam of light would prove to be important. He often called the photophone his greatest invention. Even though the photophone depended on a source of energy that was not constant--the sun--Bell wasn't a bit discouraged. He felt sure that people would one day talk using beams of light. Two much more recent developments made Bell's dream come true. In 1960, a scientist built the laser. A laser produces a highly concentrated beam of light. Shortly afterward, other scientists developed a new kind of optical fiber. The optical fiber is a glass thread. The new fiber could carry light beams long distances--as far as several miles. Question: This passage is mainly about _ . - how to use light to carry sound - what the telephone is - what the photophone is - how to use electricity to carry sound
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what the photophone is

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Read the following article and select the best answer. Article: Are you afraid of moving up to senior high school? It is a completely new experience, but you shouldn't worry. We've put together a guide to help you. You are not alone Remember that everybody else in your grade is in the same boat. You may not notice it, but they are just as nervous as you are. Moving up to senior high school is a chance, not a problem. Things are different, and all you need to do is be polite and learn the new rules. The teachers will help If you don't know what to do or are worried about something, then ask for help. Teachers are probably the best people to turn to because they have experience in helping new students. Everything changes There are lots of differences between junior high school and senior high school. You will have your lessons with different teachers in different rooms. You will have homework for different subjects on different days, so make sure you get organized. Other points If you've got an elder brother or sister at senior high school, then ask them for advice. Be yourself! It sounds simple, but people will respond much better to you if you act naturally. Going to bed early makes a difference. You'll also find it easier to get up in the morning! Question: When you don't know what to do, you can _ - write your problem down - watch your brothers - go to bed early - turn to your teachers
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turn to your teachers

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Read the following article and select the best answer. Article: ABOARD XUELONG--The stranded Chinese icebreaker, Xuelong, or Snow Dragon, broke through the Antarctic's heavy ice Hoes at about 6 pm, on Tuesday, January 7th, 2014 and headed for open water, according to Xinhua Agency. After being stranded in heavy ice for five days, the ship had broken free by Tuesday evening and was making its way through lighter ice, China Central Television reported on Tuesday. The vessel, which had been conducting China's 30th Antarctic expedition before going to the aid of the Russian ship Akademik Shokalskiy, will now continue with its scheduled activities. The trapped Russian ship was also trying to free itself on Tuesday, with the favorable west wind loosening the surrounding ice, according to CCTV. A helicopter onboard Xuelong _ 52 passengers onboard Akademik Shokalskiy to an Australian vessel on Thursday. The Russian ship had been stuck in the ice for 10 days. However, Xuelong became trapped during the rescue effort, with the ice surrounding the vessel three to four meters thick, far beyond the ship's ice-breaking capability. Qu Tanzhou, director of the Chinese Arctic and Antarctic Administration under the State Oceanic Administration, told China Daily via telephone on Tuesday that Xuelong's attempts at the breakout started on Tuesday morning. "A west wind is blowing on Tuesday, as we expected, which makes the floes and ice surrounding Xuelong more loose , creating favorable conditions for sailing on Wednesday," Qu said. On Tuesday morning, Xuelong broke ice for about 100 meters at a speed of 6 km per hour, but later became trapped in the broken floes, according to Xinhua. The efforts bore fruit on Tuesday afternoon with the ship sailing through the area of heavy ice. All the 101 crew members onboard are faring well, with entertainment facilities such as ping-pong tables, a gym and a library accessible. There is enough food onboard to last until April, sufficient water for a month and oil for four months, Qu said in a previous interview. Question: Which of the following is WRONG? - An east wind made the floes and ice surrounding Xuelong more loose. - The vessel had been conducting China's 30th Antarctic expedition. - The Russian ship had been stuck in the ice for 10 days. - Xuelong became trapped during the rescue effort.
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An east wind made the floes and ice surrounding Xuelong more loose.