شرکت در آزمون آنلاین انگلیسی 3 - انگلیسی 3

Which of the following statements is NOT mentioned in the passage?

Aerosols usually float in the air.

Nuclear power may take the place of fossil fuel.

There is an aerosol layer above the earth’s surface.

The amount of pollution in the atmosphere is a serious problem.

Scientists have found that influenza virus taken from humans can cause the disease in animals. In addition, humans can catch the disease from animals. Among animals, a greater number of wild birds seem to carry the virus without showing any signs of illness. Some scientists conclude that a large family of influenza viruses may have infected some birds that have lived on the Earth for about 100 million years and are able to carry the viruses without even having the disease. There is even enough data to show that different types of the viruse are transmitted from place to place and from continent to continent by traveling birds.

It is known that two influenza viruses can combine when both are present in an animal at the same time. The result of such combination is a great variety of the virus family. This raises the possibility that a human influenza virus can combine with an influenza virus from an animal to produce an entirely new kind. Research is being done to understand how this new type of influenza virus comes into being. Another possibility is that two types of animal influenza viruses may combine in another animal such as a pig to produce a new type which is then transmitted to humans.

What does the passage mainly discuss?

The possible ways in which new types of influenza viruses come to existence

The transmission of the influenza virus to different places by birds

The transmission of influenza virus from humans to animals

The possibility of carrying influenza virus without having the disease

Oymyakon, Russia, is one of the coldest cities in the world. It is famous for bein … cold even in the middle of summer.

locally

neatively

rarely

terribly