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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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.
单项选择题
A．Neither of the two types of rockets is very economical.B．The liquid-fuel rocket is best.C．Each type of rocket has certain advantages.D．The solid-fuel rocket is best.
A．Neither of the two types of rockets is very economical.
B．The liquid-fuel rocket is best.
C．Each type of rocket has certain advantages.
D．The solid-fuel rocket is best.
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