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【单选题】
对于可逆反应：2A（g）+B（g）?2C（g）；△H＜0，下列各图正确的是（设变化过程中物质的聚集状态没有发生改变）（ ）A.
B.
C.
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举一反三
【单选题】Which of the following sentences is a subjunctive mood?
A.
If it rains tomorrow, we will stay at home.
B.
Jim speaks as if he knew everything.
C.
I had finished it when she came back.
D.
He borrowed 10 dollars from Nick.
【单选题】Which of the following statements best describes the organization of the pas- sage?
A.
A statement illustrated by an analogy(类比).
B.
A hypothesis supported by documentation(引用文献).
C.
A comparison of two contrasting theories.
D.
A critical analysis of a common assumption.
【单选题】According to this passage, which of the following statements is true?
A.
Company workers started to dress down about twenty years ago.
B.
Dress-down has become an everyday phenomenon since the early 1990s.
C.
Dress-down Friday was first given as a favor from employers.
D.
Many workers want to wear casual clothes to impress people.
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