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【单选题】
有关汽车发动机总体构造下列说法正确的是( )。A.
发动机工作是将电能转化为热能驱动行驶。
B.
发动机两大指的是曲柄连杆机构和配气机构。
C.
燃油供给系部件是燃油箱、油泵和水箱。
D.
点火系统是汽车必备的五大系统之一。
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【单选题】The old concerns lose importance and some of them vanish altogether.
A.
develop
B.
disappear
C.
link
D.
renew
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【单选题】I stood there until the plane _____ in the sky. [ ]
A.
has disappeared
B.
disappeared
C.
had disappeared
D.
would disappeared
【单选题】What is Robert worried more about?
A.
Mankind.
B.
Global warming.
C.
Earth's survival.
D.
Disappearing glaciers.
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