单项选择题

A．It influences the surface temperature of Mars.
B．It protects living beings from harmful rays.
C．It keeps a planet from overheating.
D．It is the main component of the air people breathe.
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单项选择题
A．As one of the greatest American scholars.B．As one of America’s most ingenious inventors.C．As one of the founding fathers of the United States.D．As one of the most famous activists for human rights.
A．As one of the greatest American scholars.
B．As one of America’s most ingenious inventors.
C．As one of the founding fathers of the United States.
D．As one of the most famous activists for human rights.
单项选择题
A．Driving a cab.B．Driving a bus.C．Working in Switzerland.D．Working in France.
A．Driving a cab.
B．Driving a bus.
C．Working in Switzerland.
D．Working in France.
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