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.
<上一题 目录 下一题>
热门 试题

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.
填空题
adapted
相关试题