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问题 单项选择题

在CH50试验中，溶血程度与补体含量的关系为

A．直线
B．抛物线
C．双曲线
D．S形曲线
E．正态分布

答案

参考答案：D

解析：绵羊红细胞(SRBC)，与相应抗体(溶血素)结合后，可激活待检血清中的补体而导致SRBC溶血。其溶血程度与血清中补体的含量和功能有关。由于补体含量与溶血程度之间呈正相关，但不是直线关系，而呈S曲线关系，故通常取反应曲线中间部位即50%溶血(CH50)为判定终点。

多项选择题

主承销商应该向中国证监会制定的包括披露的情况有( )。

A．因行使超额配售选择权而发行的新股数

B．从集中竞价市场上购买的发行人股份数及平均价

C．发行人历次筹资数量

D．本次发行的总费用
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单项选择题

You have probably seen ads (广告) in newspaper or on television for mail-order companies. Perhaps a catalogue (商品目录) has been sent to you. Why do people buy things they have not seen in person Some people believe that things can be bought more cheaply by mail. Another good thing about buying by mail is that it is easier and more enjoyable to sit at home and work through a catalogue than to shop around the stores. With a catalogue from a large company, you have your own shop window for almost everything you want to buy.
Buying from a catalogue is so easy. It saves the shopper’s time and trouble. Sometimes, it saves the shopper’s money, too. But people often buy more than they can really afford(付得起) or need, because many things look so good to them. They can probably pay a certain part of the full price—a down payment. Then they pay a certain amount of money every month until the goods is paid for in full. But by then they often find what they have bought are of no use at all.

According to the text，people can get the goods first and pay ______.
[A] bit by bit
[B] a few months later
[C] until it is of no use at all
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