Question

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 from 35 to 42.

Today we take electricity for granted and perhaps we do not realize just how useful this discovery has been. Steam was the first invention that replaced wind power. It was used to drive engines and was passed through pipes and radiators to warm rooms. Petrol mixed with air was the next invention that provided power. Exploded in a cylinder, it drove a motor engine. Beyond these simple and direct uses, those forms have not much adaptability.

On the other hand, we make use of electricity in thousands of ways. From the powerful voltages that drive our electric trains to the tiny current needed to work a simple calculator, and from the huge electric magnet in steel works that can lift 10 tons to the tiny electric magnet in a doorbell, all are powered by electricity. An electric current can be made with equal ease to heat a huge mass of molten metal in a furnace, or to boil a jug for a cup of coffee.

Other than atomic energy, which has not as yet been harnessed to the full, electricity is the greatest power in the world. It is flexible, and so adaptable for any task for which it is wanted. It travels so easily and with incredible speed along wires or conductors that it can be supplied instantly over vast distances.

To generate electricity, huge turbines or generators must be turned. In Australia they use coal or water to drive this machinery. When dams are built, falling water is used to drive the turbines without polluting the atmosphere with smoke from coal.

Atomic power is used in several countries but there is always the fear of an accident. A tragedy once occurred at Chernobyl, in Ukraine, at an atomic power plant used to make electricity. The reactor leaked, which caused many deaths through radiation.

Now scientists are examining new ways of creating electricity without harmful effects to the environment. They may harness the tides as they flow in and out of bays. Most importantly, they hope to trap sunlight more efficiently. We do use solar heaters for swimming pools but as yet improvement in the capacity of the solar cells to create more current is necessary. When this happens, electric cars will be viable and the world will rid itself of the toxic gases given off by trucks and cars that burn fossil fuels

What do we call machines that make electricity? 

A. Voltages 

B. Electric magnets 

C. Generators or turbines 

D. Pipes and radiators

Answer 1

Chọn C 

Kiến thức: Đọc hiểu

Giải thích:

Tác giả có ý gì khi nói rằng điện linh hoạt?

  A. Nó rẻ và dễ sử dụng.

  B. Nó được sử dụng để điều khiển động cơ.

  C. Nó có thể được điều chỉnh để sử dụng với các mục đích khác nhau.

  D. Nó có thể được thực hiện một cách dễ dàng.

Thông tin: On the other hand, we make use of electricity in thousands of ways. From the powerful voltages that drive our electric trains to the tiny current needed to work a simple calculator, and from the huge electric magnet in steel works that can lift 10 tons to the tiny electric magnet in a doorbell, all are powered by electricity. An electric current can be made with equal ease to heat a huge mass of molten metal in a furnace, or to boil a jug for a cup of coffee.

Tạm dịch: Mặt khác, chúng ta lại sử dụng điện bằng hàng ngàn cách khác nhau. Từ việc dùng điện áp mạnh để điều khiển những đoàn tàu điện hiện đại đến dòng điện nhỏ chỉ để làm một con tính đơn giản, và từ dòng điện từ trường lớn trong các nhà máy thép có thể nâng đến 10 tấn tới dòng từ trường trong một chiếc chuông cửa, tất cả đều là năng lượng điện. Một dòng điện có thể dễ dàng làm nóng chảy một khối lượng kim loại lớn trong lò luyện hay chỉ đơn giản đun sôi lượng nước cho một tách cafe