单项选择题

In order to understand a problem thoroughly, da Vinci ______.

A．referred to numerous books
B．made use of drawings and graphs
C．compared it with many other problems
D．approached it from different angles
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单项选择题
According to the passage, which of the following statements is true
A．Einstein invented the concept of speed of light.
B．The Waste Land is a great work of literature.
C．Edison made one major invention every 10 days.
D．Mozart composed something every day even when he was sick.
单项选择题
What is the main idea of the third paragraph
A．Geniuses make creations or discoveries in large quantities.
B．Geniuses can make many achievements without much effort.
C．Geniuses inevitably experience failures before making a success.
D．Geniuses may just produce something common and ordinary.
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