76. How a High-Speed Train Works

According to the passage, what is the primary function of the pantograph?
1. To monitor the signals and track ahead on a screen.
2. To control the train's speed and keep a safe distance from other trains.
3. To transfer electricity from the overhead lines to the train's motors.
4. To make the tracks straight for a more comfortable ride.
How are most high-speed trains powered differently from old diesel trains?
1. They are powered by solar panels on the roof.
2. They run on electricity from overhead lines.
3. They use a more efficient type of diesel engine.
4. They are powered by a combination of diesel and human drivers.
The passage states that the driver is assisted by computers that perform which specific task?
1. Selling tickets to passengers.
2. Controlling the train's speed and maintaining a safe distance from other trains.
3. Designing straight tracks with gentle curves.
4. Transferring electricity to the motors via the pantograph.
Why are the tracks for high-speed trains built to be very straight with gentle curves?
1. To reduce the cost of construction.
2. To provide a safe and comfortable ride for passengers.
3. To make it easier for the pantograph to connect with the overhead lines.
4. To allow diesel engines to operate more efficiently.
What is the main idea of the essay?
1. High-speed trains are replacing all other forms of transportation.
2. High-speed trains use a combination of electricity, advanced technology, and human oversight to operate.
3. The driver of a high-speed train has a very easy job because computers do all the work.
4. The most important part of a high-speed train is its specially designed tracks.