单项选择题

Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．They carried passengers, but not cargo.
B．They were large, but surprisingly fast.
C．They were the first successful steam-powered ships.
D．They were more reliable than other ships of the 1860’s.
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单项选择题
A．The high temperatures required for its use.B．The lack of trained environmental engineers.C．The opposition of automobile manufacturers.D．The high cost of materials used in its production.
A．The high temperatures required for its use.
B．The lack of trained environmental engineers.
C．The opposition of automobile manufacturers.
D．The high cost of materials used in its production.
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.
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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