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问题 单项选择题

保护性看跌期权是指（）

A.股票加多头看涨期权组合

B.股票加多头看跌期权组合

C.股票加空头看涨期权组合

D.出售1股股票，同时卖出1股该股票的看涨期权

答案

参考答案：B

解析：保护性看跌期权，是股票加多头看跌期权组合，即购买1股股票，同时买入1股该股票的看跌期权。

改错题

下面短文中有10处语言错误。请在有错误的地方增加，删除或修改某个单词。

增加：在缺词处加一个漏字符号（∧），并在其下面写上该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写上修改后的词。

注意：1.每处错误及修改均仅限一词；

2.只允许修改10处，多者（从第11处起）不计分。

Today is my father’s birthday. To celebrate his birthday, I went to a shop and choose a present for him. After that, I went home by the train. On the way, I was imagining how happily my father would be when he accepted the present. The train got to the next stop before I knew it. An old lady got the train. Every seat was taken, but she had to stand with two heavy bags in both of her hand.

After an immediate hesitation（犹豫）, I gave my seat to her and he was grateful for all what I did.

In my opinion, give others a hand whenever they are in trouble not only brings happiness to the ones who receive it but also to the ones who give it.
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单项选择题 A1/A2型题

分馏法分离挥发油的主要依据是（）

A.密度的差异

B.溶解性的差异

C.沸点的差异

D.官能团化学性质的差异

E.酸碱性的差异
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