Selective attention can be affected by ___________.

听力原文： One important thing about art movements is that their popularity can be affected by social conditions, which are themselves often affected by historical events. As an example, look at what happened in the United States early in the 20th century, around the time of the Great Depression, the art movement known as the Regionalism had begun in the United States even before the Depression occurred. But it really flourished in the 1930s, during the depression years. Why? Well, many artists who had been living in big cities were forced by the economic crisis to leave those big cities and move back to their small towns in rural America. Some of these artists came to truly embrace the life in small towns and to reject city life in so-called "sophisticated society". These artists or specifically certain painters really built the regionalist movement. They created things in everyday life in small towns or farming areas. And their style. was not all neutral, really big glorified or romanticized country life, showing it stable, wholesome, and embodying important American traditions. And this style. became very popular, in part because of the economic conditions of the time. You see, the Depression had caused many Americans to begin to doubt their society. But regionalism artists painted scenes that glorified American values, scenes that many Americans could easily identify with. So the movement helped strengthen people's faith in their country, faith that had weakened as the result of the depression. But in the 1940s, before and after the Second World War, American culture began to take on a much more international spirit, and Regionalism, with its focus on small town life, well, it lost a lot of popularity, as American society changed once again.

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A．How historical events affected an art movement.

B．How artists can influence economic conditions.

C．Why a certain art movement failed to become popular.

D．How valuable paintings were lost during wartime.

According to the talk, workers in "zones of quiet" can

A．be more affected by noise.

B．hear talk from outside the zone.

C．work more efficiently.

D．be heard outside the zone.

A．They should be avoided by all means.

B．They are bad for effective management.

C．They can be good for an organization.

D．They are surprisingly complicated.

听力原文： One important thing about art movements is that their popularity can be affected by social conditions, which are themselves often affected by historical events. As an example, look at what happened in the United States early in the 20th century, around the time of the Great Depression, the art movement known as the Regionalism had begun in the United States even before the Depression occurred. But it really flourished in the 1930s, during the depression years. Why? Well, many artists who had been living in big cities were forced by the economic crisis to leave those big cities and move back to their small towns in rural America. Some of these artists came to truly embrace the life in small towns and to reject city life in so-called "sophisticated society". These artists or specifically certain painters really built the regional-ist movement. They created things in everyday life in small towns or farming areas. And their style. was not all neutral, really big glorified or romanticised country life, showing it stable, wholesome, and embodying important American traditions. And this style. became very popular, in part because of the economic conditions of the time. You see, the Depression had caused many Americans to begin to doubt their society. But regionalism artists painted scenes that glorified American values, scenes that many Americans could easily identify with. So the movement helped strengthen peoples faith in their country, faith that had weakened as the result of the depression. But in the 1940s, before and after the Second World War, American culture began to take on a much more international spirit, and Regionalism, with its focus on small town life, well, it lost a lot of popularity, as American society changed once again. Questions 20 to 22 are based on the passage you have just heard. 20. What is the lecture mainly about? 21. What kind of scene might be shown in a typical regionalist painting? 22. According to the speaker, what happened in the USA in the 1940s around the time of WWII that affected the popularity of the regionalist art?20．

A．People working in a large factory.

B．People walking on crowded city streets.

C．An everyday activity in a small town.

D．A well-known historical event.

It can be concluded from the passage that the immune systems of ani mal

A．can he weakened by conditioning

B．can be suppressed by drug injections

C．can be affected by frequent doses of saccharin

D．can be altered by electric shocks

It can be concluded from the passage that the immune systems of animals ______ .

A．can be altered by electric shocks

B．can be weakened by conditioning

C．can be suppressed by drug injections

D．can be affected by frequent doses of saccharin