期货交易所的非期货公司结算会员的期货从业人员不得代理客户从事期货交易。（）

假定每一个信用卡客户具有唯一的客户号。如果实体“客户信息”属性依次为“客户号、客户姓名、证件号码、开卡时间、卡状态”，其中，一个客户可以有多个卡，每个卡对应唯一的客户号；实体“客户交易记录”属性依次为“客户号、交易日期、交易开始时间、交易结束时间，交易类型、交易结果、交易金额”，其中一个客户一天可以进行多个交易，但同一时间只能进行一个交易。那么，实体“客户信息”的主键是 (40) ，实体“客户交易记录”的主键是 (41) ，这两个实体型间 (42) 联系。

A．客户号
B．客户号、交易日期
C．客户号、交易日期、交易开始时间
D．客户号、交易日期、交易开始时间、交易类型

阅读理解。

     If you don't keep yourself warm enough, winter can be a time of illness.

     During the winter months, people easily get colds and flu (流感). Many think they are the same, but

these two illnesses are different.

     Colds can stay with you for up to a week. You will have a running nose, sore throat, headache, cough

and a fever.

     Flu is more serious. You will feel sick very quickly. You will have a fever and a headache. Your body

will hurt and become weak. This could last for up to four weeks. 

     Is there any way to keep yourself away from colds and flu? Staying clear of people with colds or flu

may work.

     Try not to touch (触摸) your nose or eyes if you have been close to someone who has a cold. Wash

your hands, especially after cleaning your nose.

     Going out with wet hair can also give you a cold!

     If you catch a cold or flu, go to bed and rest. Doing this will help you get better. Drink lots of water.

Stay in a warm, well-aired room. If you have a headache, or your muscles hurt, take some medicine.

1. 阅读上面的短文，根据短文内容帮助Mary完成下面的一封信。

Dear Mom and Dad, 

     How's everything going?

     I'm having great fun at winter camp. But for the past two days, I'm not feeling very well. I don't know

what's wrong. Maybe I have ____ a cold. I have a ____ nose and ____ throat. Last night I couldn't sleep

because I had a _____, ____ and a slight ____. But don't worry. I've been to the doctor's. The doctor told

me that it was not ____, which would otherwise be more ____. He advised me to ____ lots of water, lie

down and ____ for a few days. He said I would get well in a week. Okay, so much for now.  

     Take good care of yourselves, too.

                                                                                                                                             Love,

                                                                                                                                             Mary

2. 假设你是Mary的朋友Tina. 得知她生病的消息后，你很着急，立刻发一封e-mail，给她提一些建议

（三至五条，可参考短文，字数100字左右）。

冷箱开车时，其露点必须（）。

A．＜-70℃

B．＜-65℃

C．＜-45℃

D．＜-40℃

豆腐文化节前夕，我市对观光路工程招标时，接到甲、乙两个工程队的投标书，甲、乙施工一天的工程费用分别为1.5万元和1.1万元，市政局根据甲乙两队的投标书测算，应有三种施工方案：

（1）甲队单独做这项工程刚好如期完成；

（2）乙队单独做这项工程，要比规定日期多5天；

（3）若甲、乙两队合作4天后，余下的工程由乙队单独做，也正好如期完成。

在确保如期完成的情况下，你认为哪种方案最节省工程款，通过计算说明理由。

回收装置系统回压异常升高后，应检查（）。

A、液硫管线保温情况

B、冷凝器冷凝水温度

C、仪表显示是否准确

D、以上全部