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【单选题】
上图所示分别为A.
B.
C三个化合物的红外光谱图,图谱所对应的化合物是:____ A为1—辛烯、B为正辛烷、C为1—辛炔。 A为正辛烷、B为1—辛烯、C为1—辛炔。 A为1—辛烯、B为1—辛炔、C为正辛烷。 A为1—辛炔、B为1—辛烯、C为正辛烷。
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A.
talking; but
B.
was talking; though
C.
talks; though
D.
talked; however
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【单选题】Each of the following sentences contains ONE mistake. Find it out and correct it. Jack was washing dishes then Mary knocked at the door and entered.
A.
Jack was washing dishes as Mary knocked at the door and entered.
B.
Jack was washing dishes while Mary knocked at the door and entered.
C.
Jack was washing dishes when Mary knocked at the door and entered.
D.
Jack was washing dishes as soon as Mary knocked at the door and entered.
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