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.
单项选择题
A．Students might not consider them to be an important part of culture.B．They symbolize the rebellion of youth in the 1950’s.C．They are discussed in the students’ textbook.D．They have been worn for hundreds of years.
A．Students might not consider them to be an important part of culture.
B．They symbolize the rebellion of youth in the 1950’s.
C．They are discussed in the students’ textbook.
D．They have been worn for hundreds of years.
相关试题