在可供选择的投资中，假定一项投资的收益可能会由于经济运行情况的不同出现几种结果，具体数据如表1所示，则该项投资的预期收益率为()。
表1 投资概率与收益率
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The example of what Plato thought in the passage shows that ______.
A. the development of science really can solve a great many of the problems on which philosophers still argue.
B. Plato knew nothing about physics.
C. the scientists have achieved a lot in terms of light theory.
D. different people have different ways of perception.
How many kinds of ideas are there about the future？
A. Two.
B. Three.
C. Four.
D. Five.
What field can our descendants know？
A. The origin of human beings.
B. Some questions that perplex us today.
C. Many philosophical problems which Marx and Engels wrote rather little.
D. The future.
What are the functions of studying philosophies mentioned in the passage？
A. The study of philosophies would make our own idea flexible.
B. The study of philosophies would help prepare us for the future and guide our actions.
C. The study of philosophies would enable us to understand how things develop as to better tackle the future.
D. All of the above.
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