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【单选题】
黄酮类化合物呈色的最主要原因:A.
具有酚羟基
B.
具有交叉共轭体系
C.
具有苯环
D.
具有羰基
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反馈参考答案：
举一反三
【判断题】While listening, you don't understand a word, you need to decide if the information is essential before coping with the comprehension problem.
A.
正确
B.
错误
【单选题】II. Choose the correct answer to each of the following questions: 1. Which of the following statements was correct around the time of the American Revolution?
A.
The American had the mixed blood of Europeans or their descendants
B.
The American had the mixed blood of Europeans with American Indians
C.
The American had the mixed blood of Europeans with blacks
D.
The American had the blood of the English and their descendants only
【单选题】Choose the best answer for each of the following questions Which of the following would express the main idea of the passage?
A.
Aging may conjure up images of wrinkles, forgetfulness and feebleness.
B.
The elderly are the distinguished and wise segment of a modem society.
C.
Age biases can have negative and long-lasting impacts on our own health.
D.
Negative perceptions of the elderly are unacceptable to many scientists.
E.
None of the above.
【单选题】You prefer to work while listening to music. How should you handle this when you work in a cubicle?
A.
Keep the music low and agreeable (no foul words or loud tunes)
B.
Talk to the people surrounding you and make sure your choice of music is agreeable to them
C.
Use headphones
D.
Blast it out, if your workplace is casual
【简答题】某被评估企业截至评估基准13，经核实后的应收账款余额为1460000元，该企业前5年的应收账款累计余额7200000元，处理坏账累计额610000元，按坏账比例法确定该企业应收账款的评估值最接近于（ ）元。
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