单项选择题

What Cause's the soup can to swell

A．Meat.
B．Sulfur dioxide gas.
C．Hydrogen sulfide.
D．Pathogen.
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单项选择题
The tone of the passage is______.
A．hopeful
B．sarcastic
C．regretful
D．apologetic
单项选择题
Which of the following countries lags behind the United States by the largest margin
A．France
B．Britain
C．Germany
D．Japan
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