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【判断题】
1866年，德国工程师奥托研制出了活塞式四冲程内燃机，人们将四冲程循环称为奥托循环。A.
正确
B.
错误
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【简答题】原名盛京宫阙，后称奉天行宫的是位于沈阳的哪座宫殿？
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【单选题】They had to ______ their way through a mist that was rapidly turning into a thick fog.
A.
converge
B.
grope
C.
strive
D.
grip
【单选题】_______the thick clouds, you would find the kite in the sky easily.
A.
Had it not been for
B.
If it were not
C.
If it had not been for
D.
Were it not for
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