【单选题】In the last sentence of the second paragraph, 'they' refers to______.
【判断题】采用过冷循环理论上总是有利的,而且 过冷度越大 , 对 循环越有利 。
【简答题】When going back home, the author felt all the following EXCEPT __________. [A] desperate [B] indignant [C] sorrowful [D] disappointed
【单选题】The author had trouble operating his VCR because______.
A.
he had neglected the importance of using the timer
B.
the machine had far more technical features than necessary
C.
he had set about using it without proper training
D.
its operation was far more difficult than the designer intended it to be
【判断题】Christmas Eve refers to the night of December 24th.()
【单选题】In the passage the author is primarily concerned with ______ .
C.
analyzing a problem objectively
【单选题】On the evening the author fell over, someone______.
A.
had moved his card index
B.
had been playing card games
C.
had knocked over his boxes containing cards
D.
had looked at his collection of diamonds
【单选题】In the 6th sentence of the 2nd paragraph, the word 'This' refers to______.
A.
the decrease of the oil industry
B.
the increase of measures taken
C.
the government's assumption
D.
the level of sulphur dioxide
【单选题】工程上常讲的“一面两销”一般限制了工件的( )个自由度