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．Alan thought Sally was too hard on Alex.B．Alan liked Alex very much and would write him a very good reference.C．Alan would turn down Alex’’s request.D．Alan could see something good even in a very bad person.
A．Alan thought Sally was too hard on Alex.
B．Alan liked Alex very much and would write him a very good reference.
C．Alan would turn down Alex’’s request.
D．Alan could see something good even in a very bad person.
单项选择题
The space agencies are reluctant to open up space to tourists.
A．Y
B．N
C．NG
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