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【单选题】
理想气体经历绝热自由膨胀，下述答案中哪一个正确（）A.
ΔU＞0，ΔS＞0；
B.
ΔU＜0，ΔS＜O；
C.
ΔU＝0，ΔS＜0；
D.
ΔU＝0，ΔS＞0
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【单选题】Jim did very well. He ________ two goals before half-time. [ ]
A.
had scored
B.
had kicked
C.
scored
D.
made
【单选题】Though inland waterways were important transportation system, they were soon replaced by the more convenient railroads.
A.
正确
B.
错误
【单选题】Jim had a very ________ look when Tom told him Mary was not coming.
A.
disappointing
B.
disappointed
C.
disappoint
【单选题】Jim had a very________look when Tom told him Mary was not coming.
A.
disappoint
B.
disappointed
C.
disappointing
【单选题】The employees were all very exhausted, but ______ of them would stop to take a break.
A.
neither
B.
none
C.
nor
D.
no
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