单项选择题


Questions 11 to 14 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage.
What Is the base of film today

A．Salt.
B．Silver Salt.
C．Metal.
D．Plastic.
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More than one third of the Chinese in the United States live in California, ______ in San Francisco.
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