单项选择题

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．A fuel that burns cleanly.B．An oil additive that helps cool engines.C．A material from which filters are made.D．An insulating material sprayed on engine parts.
A．A fuel that burns cleanly.
B．An oil additive that helps cool engines.
C．A material from which filters are made.
D．An insulating material sprayed on engine parts.
单项选择题
A．Because every species becomes extinct.B．Because humans beings are powerful enough to kill other species.C．Because of over-population.D．Because human being is still a young species though it is exptoiting the environment.
A．Because every species becomes extinct.
B．Because humans beings are powerful enough to kill other species.
C．Because of over-population.
D．Because human being is still a young species though it is exptoiting the environment.
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