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【判断题】
卡诺循环是理想循环，一切循环的热效率都小于卡诺循环的热效率。A.
正确
B.
错误
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【简答题】He didn’t have any money for a bike.(改为肯定句) He _________ __________ money for a bike.
【单选题】Last night Dad and Mum didn't come back home _____ I finished my homework. [ ]
A.
while
B.
if
C.
until
【单选题】Last night Mr. Crook didn't come back at the usual time. ___, he met some friends and stayed out until midnight. [ ]
A.
Meanwhile
B.
However
C.
Instead
D.
Yet
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