Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. The quest for sustainable sources of energy study the energy has led humans to study the energy potential of the sun and the wind, as well as the immense power created by dammed rivers. The oceans, too, represent an impressive source of potential energy. For example, it has been estimated that the oceans could provide nearly 3,000 times the energy generated by hydroelectric dams such as the Hoover Dam. Yet, this source remains quite difficult to exploit. But this challenge has not prevented scientists from trying. Within the last few decades, several technologies that can transform the ocean’s immense forces into usable electricity have been invented and introduced. Some focus on capturing the power of the changing tides, while others rely on thermal energy created by oceans in certain tropical regions. However, the most common and easiest-to-develop technologies are those designed to harness the power inherent in the ocean’s waves. There are several methods by which ocean-wave energy can be collected. All of them work because the movement of the water that the waves induce creates storable energy by directly or indirectly driving a power generator. In one such technology, the changing water levels in the ocean that are produced by waves lift a long floating tube comprised of many sections connected by hinges. As the sections move up and down with the water, they pump a special fluid through the tube that can be used to drive a generator. Another technique works on a similar principle, only the floating object rocks back and forth with the motion of the water instead of up and down. A third method of collecting wave energy relies on the rising water from the waves to compress air in a partially submerged chamber. As the waves rush into the chamber, they push the air out through a narrow tunnel. Located inside this tunnel is a turbine connected to a power generator. The movement of the air turns the turbine, which feeds energy into the generator. The drawback to each of these concepts is that the they make it necessary to have many pieces of machinery linked together. This presents a problem because the larger the device, the more vulnerable it is to damage from hazardous ocean environments, and the more likely it is to interfere with otherwise unspoiled coastal scenery. Also, these methods demand the construction of site-specific machines that take into consideration average local wave heights and sea conditions. Such a requirement can be quite cost-prohibitive, because engineers must create unique power generation mechanism for each site. In other words, the ability to get power from waves differ from region to region. Japan, Norway, and the UK have attempted to generate energy by capturing the power of ocean waves. In northern Scotland, the first power plan to use wave power, OSPREY ( Ocean Swell Powered Renewable Energy ), began operating in 1995. It followed the principle of the third method described above : waves entering a partially submerged chamber pushed air into turbines to generate electricity. The electricity was then transmitted to power collectors in the shore via underwater cables. Unfortunately, the OSPREY plant was destroyed in a large storm, highlighting an unavoidable difficulty associated with this kind of power generation. The potential benefits of wave-based energy are hard to ignore. Once the proper machinery is produced and installed, the energy is free. Maintenance cost are small, and the equipment does not pose any threats of environmental pollution. And best of all, the amounts of energy produced are enormous. However, these theoretical advantages have yet to be fully realized. In many cases, a lack of government funding has inhibited the technologies from advancing. For example, despite the relative abundance of proposed wave-power devices, many have not been adequately tested, and most have been evaluated only in artificial pools where they are not subjected to the harsh marine conditions that exist in actual oceans. Protecting the equipment from the sea’s destructive forces, as well as the fundamental task of determining feasible locations for collecting energy source are substantial and will require more time to overcome.
According to paragraph 3, which of the following is true about wave–power technologies?
A. Many of them use submerged objects to obtain the waves’ energy
B. Compressed air must be present for them to work properly
C. They undertake three steps in order to collect wave power
D. They rely on the water’s motion to create electricity
Đáp án là D.
Theo đoạn 3, câu nào sau đây đúng về công nghệ năng lượng sóng?
A. Nhiều trong số chúng dùng vật thể ngập nước để lấy được năng lượng sóng.
B. Không khí bị nén phải tồn tại cho chúng hoạt động hiệu quả.
C. Chúng thực hiện 3 bước để thu thập năng lượng sóng.
D. Chúng dựa vào sự chuyển động của nước để tạo ra điện.
Dẫn chứng: All of them work because the movement of the water that the waves induce creates storable energy by directly or indirectly driving a power generator.
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. They froze in ________when they saw the lion.
Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions
In my country we have to do nine core subjects and then we can choose several other
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. I am ________tired to think about that problem at the moment.
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. : ________anything else, please ring the bell for the attendant.
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Monica is ________for her ambition and determination by all of her teachers.
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions
He packed ________his job and went traveling in Nepal
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions
“The baby is crying! Will you ________while 1 prepare his milk?”
Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions
Ernest Hemingway wrote The Old Man and the Sea, in addition to a number of the other work
Mark the letter A, B, C or D on your answer sheet to indicate that best combine this pair of sentences in the following questions
Mike has expertise in gardening. Mike is an accomplished carpenter
Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions
Don’t get angry with me for your failure. You are yourself to blame by it and it is nobody else’s fault
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. On the way the bus stopped to pick up a ________
Mark the letter A, B, C or D on your answer sheet to indicate that best combine this pair of sentences in the following questions
My friends are good at drawing. I am good at drawing
Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions
His story was so funny that it made us all laugh
Read the following passage, and mark the letter (A, B, C or D) on your answer sheet to indicate the correct answer for each of the blanks.
THE BENEFITS OF JOINING A SPORTS CLUB
Everyone, old or young, should think about joining a sports club. There are many benefits of being a (31)________of a club. First of all, you have the opportunity not just to play your favorite sport on a regular basis, but also to improve. Most clubs have training sessions or even professionals who (32)________lessons. Secondly, it’s a chance to meet people who enjoying doing the same things as you so you will probably get (33)________with them and end up with a good network of friends. Also these clubs usually have an excellent social life as they arrange parties and special occasions at the club where you can meet to talk and eat together and generally have a good time. Many people (34)________up sports in their early teens but it is good idea to continue as doing sport is a way of relieving stress and giving you more energy as well as being a good break from your studies. Best of all, a lot of clubs can arrange to get tickets for top sporting events that are hard to (35)________This means you can often get front row seats for matches and competitions in your favorite sport, or you may even be able to see your favorite team. Well worth joining!
Điền vào ô số 31
Read the following passage, and mark the letter (A, B, C or D) on your answer sheet to indicate the correct answer for each of the blanks.
THE BENEFITS OF JOINING A SPORTS CLUB
Everyone, old or young, should think about joining a sports club. There are many benefits of being a (31)________of a club. First of all, you have the opportunity not just to play your favorite sport on a regular basis, but also to improve. Most clubs have training sessions or even professionals who (32)________lessons. Secondly, it’s a chance to meet people who enjoying doing the same things as you so you will probably get (33)________with them and end up with a good network of friends. Also these clubs usually have an excellent social life as they arrange parties and special occasions at the club where you can meet to talk and eat together and generally have a good time. Many people (34)________up sports in their early teens but it is good idea to continue as doing sport is a way of relieving stress and giving you more energy as well as being a good break from your studies. Best of all, a lot of clubs can arrange to get tickets for top sporting events that are hard to (35)________This means you can often get front row seats for matches and competitions in your favorite sport, or you may even be able to see your favorite team. Well worth joining!
Điền vào ô số 34