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【单选题】
下列涉及有机物的说法正确的是A.
甲酸的性质与乙酸类似，都不能被酸性高锰酸钾溶液氧化
B.
石油和植物油都是混合物，且属于不同类的有机物
C.
乙醇转化为乙醛的反应有碳氧双键生成，属于消去反应
D.
纤维素、蔗糖、葡萄糖和淀粉酶在一定条件下发生水解反应
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举一反三
【单选题】He is said___________a book on the history of Chinese tone bridge , but I don’t know if he has finished it.
A.
to have written
B.
to be writing C . having writing D writing
【单选题】______ he wanted to go out with his friends at the weekend, he had to stay behind to finish his assignment.
A.
Much though
B.
Much as
C.
As much
D.
Though much
【单选题】He______ the work yesterday, but he didn't.
A.
must have finished
B.
need have finished
C.
finished
D.
should have finished
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