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Science and Nature Quiz for 10 August 2011

A new science quiz is available each week. Try our daily general knowledge quiz or work through our archive of daily and themed quizzes.

Question 1: The Dow Jones Industrial Average is a stock market index that shows how stocks of large, publicly-owned companies based in the USA have traded during a standard stock market trading session. How many company's stocks does it track?

A
100
B
30
C
50
D
500