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.
Sunlight is solar energy. Sunlight is needed for growing plants that you eat to get energy. Sunlight is also used to make clean electricity. Burning fossil fuels to make electricity pollutes our atmosphere and rivers. Fossil fuels are expensive and limited sources of energy. Nuclear fission is used to create enormous amount of heat and electricity. However, nuclear fission forms dangerous radioactive waste.
Sunlight offers many ways to get energy. A window can allow warm sunlight into your room. Solar water-heating systems can use sunlight to warm the water for your home, swimming pool and school. Sunlight also warms the Earth and causes wind. Electricity can be made by wind generators.
Photovoltaic, or PV system use a type of material that converts sunlight into electricity. PV systems can power your air conditioner or a satellite like the International Space Station. PV systems are also used to run a calculator, recharge cell phone, or even power lightweight cars.
Sunlight is also changed into electricity by concentrating solar power or CSP systems. CSP systems have mirrors that focus the sunlight. The concentrated sunlight turns water into steam which turns a turbine that is connected to an electric generator. A CSP system usually uses sunlight to make steam. CSP power plants can store large amount of heat. The stored heat is used to make electricity at night. During cloud days, many CSP plants can also burn natural gas to provide the heat that is used to turn water into steam.
Sunlight provides the energy needed to grow plants and make large amount of environmentally friendly heat and electricity. Solar energy can provide power today and for a long time in the future.
To help the readers understand some of the benefits of solar energy, the author ________
A. provides a list of solar energy projects.
B. lists in chronological order the invention of various systems that gather the energy of sunlight
C. describes in detail how a PV system works.
D. briefly compares and contrasts the differences in using fossil fuels, nuclear fission and solar energy in electric power systems
Đáp án D
Để giúp độc giả hiểu về ích lợi của năng lượng mặt trời, tác giả ______
A. liệt kê một loạt dự án quang năng.
B. liệt kê theo thứ tự ra đời của các hệ thống tập hợp năng lượng mặt trời.
C. mô tả chi tiết quy trình của hệ thống PV.
D. so sánh ngắn gọn và tương phản sự khác biệt trong việc dùng nhiên liệu hoá thạch, hạt nhân nguyên tử và năng lượng mặt trời trong hệ thống điện năng.
Trong đoạn 1, tác giả đưa ra sự so sánh và tương phản ngắn gọn về các dang năng lượng, nêu lên tác dụng và hạn chế của chúng, từ đó làm bật lên lợi ích của năng lượng mặt trờ