решебник.рф ГДЗ по английскому языку 11 Класс класс упражнение - 68 р. 4
Change the text below into the passive. In which examples is the person who does the action (the agent) not needed?
Snakes predict EARTHQUAKES!
Scientists in China have discovered an unusual way of predicting earthquakes – snakes! Experts are observing snakes at local snake farms to see if their behavior changes before an earthquake. The scientists link cameras to a broadband Internet connection. They believe that the snakes can sense earthquakes from 120 km away, three to five days before they happen. They abandon their nests or even smash into walls to escape. Because frequent earthquakes strike China, scientists must find a reliable method of predicting them to avoid the terrible injury and loss of life that they cause.
An unusual way of predicting earthquakes has been discovered by scientists in China — snakes! Snakes at local snake farms are being observed by experts to see if their behavior changes before an earthquake. Cameras are linked to a broadband Internet connection by the scientists. Earthquakes are believed to be sensed by the snakes from 120 km away, three to five days before they happen. Their nests are abandoned or walls are smashed into walls to escape. Because China is struck frequently by earthquakes, a reliable method of predicting earthquakes must be found by scientists to avoid injury and loss of life that is caused by earthquakes.
When the agent is unknown, unimportant, or obvious from the context, it may be omitted:
- are being observed by experts — by experts можно опустить, из прошлого предложения и так понятно, что за змеями наблюдали ученые/эксперты
- are linked … by the scientists — тоже очевидно, что этим занимались ученые/эксперты
- must be found by scientists — очевидно, что это задача для ученых/экспертов
- is caused by earthquakes — из контекста понятно, что речь про землетрясения, можно опустить или заменить на by them