单项选择题

Edison never stopped ______ new and better ways to do things.

A．to search for
B．to search
C．searching for
D．searching
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单项选择题
If you walk fast for 30 minutes every day, how many calories will be used for one week
A．100.
B．700.
C．1,400.
D．200.
单项选择题
Which of the following statement is true according to the first paragraph
A．Edison received the first American patent.
B．Edison got the most patents in America at that time.
C．Edison was the only American inventor.
D．Edison was the first American inventor.
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