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．He read the cabinet report.B．He read the newspaper.C．He listened to a radio report.D．His secretary telephoned him.
A．He read the cabinet report.
B．He read the newspaper.
C．He listened to a radio report.
D．His secretary telephoned him.
单项选择题
A．In the early 1900’’s.B．In the mid-1800’’s.C．In the early 1800’’s.D．In the late 1800’’s.
A．In the early 1900’’s.
B．In the mid-1800’’s.
C．In the early 1800’’s.
D．In the late 1800’’s.
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