单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
What did Edward care most in his work

A．Liberty.
B．Equality.
C．Social issues.
D．Environmental issues.
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单项选择题
How many people were said to be injured at least
A．342.
B．900.
C．1242.
D．1 million.
单项选择题
What was De Forest’s most famous device
A．Telephones.
B．Electron tube.
C．Long wave radio broadcasts.
D．Shortwave radio broadcasts.
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