单项选择题

What was deposited on the bottom of the gas bottle

A．Magnesium.
B．Limestone.
C．Carbon.
D．Water.
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填空题
将way改为option。
单项选择题
A．Probing into the privacy of famous people.B．Short articles about less important events.C．Colorful pictures and smaller size.D．All above.
A．Probing into the privacy of famous people.
B．Short articles about less important events.
C．Colorful pictures and smaller size.
D．All above.
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