单项选择题

A．Iron.
B．The Earth’s crust.
C．The minerals from the Mars.
D．Some unknown planet.
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单项选择题
A．Depressed.B．Ecstatic.C．Worded.D．Ambivalent.
A．Depressed.
B．Ecstatic.
C．Worded.
D．Ambivalent.
单项选择题
A．He has covered about 900 miles.B．He sometimes skips breakfast.C．It is hard for him to cover over 50 miles a day.D．Missouri is a place which has impressed him most
A．He has covered about 900 miles.
B．He sometimes skips breakfast.
C．It is hard for him to cover over 50 miles a day.
D．Missouri is a place which has impressed him most
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