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【多选题】
对环境有害的窜缸混合气对发动机造成损害的两个原因是:A.
导致排放口的堵塞,结果降低了排放效率。
B.
与发动机机油发生反应生成油泥,导致发动机部件快速磨损。
C.
窜缸混合气中未燃烧的燃油会稀释发动机机油。
D.
导致进气口的堵塞,结果降低了进气效率。
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举一反三
【单选题】He still remembers ______ to Shanghai when he was very young.
A.
taking
B.
being taken
C.
taken
D.
to take
【单选题】He still remembers the place ______ we visited last year?
A.
that
B.
where
C.
when
D.
in which
【简答题】以不同的初速度将两个物体同时竖直向上抛出并开始计时。一个物体所受空气阻力可忽略，另一个物体所受空气阻力大小与物体速率成正比。下列用虚线和实线描述两物体运动的v-t图象，可能正确的是（ ）。
【单选题】Jim has retire, but he still remembers the happy time ___with his students.
A.
to spend
B.
spend
C.
spending
D.
spent
【单选题】Now he still remembers ____ it ____ him to get the chance.
A.
that; took
B.
what; cost
C.
how; cost
D.
what; forced
【单选题】He still remembers __________ to Shanghai when he was a child .
A.
taking
B.
to take
C.
to be taken
D.
being taken
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