题目内容

X
123 4
P
0.2 0.3α 0.4
(1)求常数α；
(2)求X的数学期望E(X)．

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听力原文： Broadly speaking, there are two types of paintings: representational and abstract. The former portrays specific, recognizable physical objects.
For most of history, the primary purpose of painting had been to portray images. Starting with the Post-Impressionists, however, the emphasis began to shift to unconscious feeling.
There are two types of abstract paintings. "Abstracted" paintings may not look realistic, but you can get an idea of what you are looking at. "Pure" abstract paintings are just shapes, colors, lines, patterns, and so on.
In truth, there is a lot more to abstract art than what meets the eye. To truly appreciate a work of art, you need to understand there must be context involved and a particular environment created. More importantly, art allows us indirect access to our inner psyche. Great art affords a way to get in touch with the unconscious part of our existence, even if we don't realize what we are doing.
The reason abstract art has the potential to be so powerful is that it keeps the conscious distractions to a minimum. This, of course, only works if you cooperate with the artist. If you are to truly appreciate a work of art, you must be willing to let yourself go, to put yourself in the hands of the artist, so to speak, and let him take you wherever he wants.
Broadly speaking, there are two types of paintings :【21】and abstract. The former portrays specific, recognizable physical objects.
For most of history, the primary purpose of painting had been to portray images. Starting with the Post-Impressionists, however, the【22】began to shift to unconscious feeling.
There are two types of abstract paintings. "【23】" paintings may not look realistic, but you can get an idea of what you are looking at. "【24】" abstract paintings are just shapes, colors, lines, patterns ,, and so on.
In truth, there is a lot more to abstract art than what meets the eye. To truly appreciate a work of art, you need to understand there must be【25】involved and a particular【26】created. More importantly, art allows us indirect access to our inner【27】. Great art affords a way to get in touch with the unconscious part of our【28】, even if we don't realize what we are doing.
The reason abstract art has the【29】to be so powerful is that i: keeps the conscious distractions to a minimum. This, of course, only works if you【30】with the artist. If you are to truly appreciate a work of art, you must be willing to let yourself go, to put yourself in the hands of the artist, so to speak, and let him take you wherever he wants.
(21)

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