题干

关于固体、液体和气体,下列说法正确的是(   )

A:固体可以分为晶体和非晶体两类,非晶体和多晶体都没有确定的几何形状

B:液晶像液体一样具有流动性,而其光学性质与某些多晶体相似,具有各向同性

C:在围绕地球运行的航天器中,自由飘浮的水滴呈球形,这是表面张力作用的结果

D:空气的相对湿度越大,空气中水蒸气的压强越接近同一温度时水的饱和汽压

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答案(点此获取答案解析)

A,C,D

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    Animals have been used, and sometimes abused(虐待), in movie-making since the early days of the industry. However, the American Humane Association has worked for many years to protect animals in films. And, the digital age might make animal actors unnecessary.

    The new film “Dolphin Tale” tells about a dolphin that loses her tail because of an injury from a crab-trap. A doctor provides her with an artificial tail that saves her life. The film is based on a real event. And the star of the film, Winter, is a real dolphin that lost her tail. The American Humane Society worked with the movie's makers to make sure Winter stayed safe and healthy during filming. The animal protection group does this for all animal actors in America.

    A thick book of rules and guidelines tells Hollywood moviemakers how to treat animals. Karen Rosa leads the American Humane Society's film and television group. He said, “Everything from the smallest insect to the largest mammal shall be protected. We believe that for the sake of entertainment, everybody should go home alive.

    This was not always the policy in the early days of film. In 1939, a horse was forced off a mountain, falling to his death, in the movie “Jesse James.” The next year, guidelines were established to guarantee safe and healthy conditions for animals in movies.

    A new film “Rise of the Planet of the Apes” tells about the creation of super intelligent apes through science. However, no real animals were among the performers. Computer generated imagery provided the chimpanzees, gorillas and orangutans that movie goers see. Clare Richardson is the president of the Diane Fossey Gorilla Fund. She says computer generated imagery should decrease the use of animals in the film industry. She praises movie makers for the use of computer-made animals.