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.
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单项选择题
A．Because it is bad for their health.B．Because those people are lazy.C．Because those people maintain good habits.D．Because those measures haven’’t changed people’’s bad habits permanently.
A．Because it is bad for their health.
B．Because those people are lazy.
C．Because those people maintain good habits.
D．Because those measures haven’’t changed people’’s bad habits permanently.
单项选择题
A．They defend the bone against viruses.B．They prevent oxygen from entering the bone.C．They break down bone tissue.D．They connect the bone to muscle tissue.
A．They defend the bone against viruses.
B．They prevent oxygen from entering the bone.
C．They break down bone tissue.
D．They connect the bone to muscle tissue.
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