标准差和变差系数一样，可以衡量相对风险。

Reading comprehension.

                                                     Ten Top Tips for Your Travels

◆ Put on your most comfortable clothes and shoes when you are going for a long journey.

◆ It may be boring to travel on trains or buses, so take a good book or some interesting magazines with you.

◆ If you're going to somewhere hot, you'd better take your sun block (防晒霜) and sunglasses with you, or

     it may hurt your skin.

◆ If you're going to somewhere cold, you'd better take your warm clothes with you, or you may catch a cold. ◆ Take a camera with you so that you can take some pictures to record those special moments.

◆ Be careful with your things whenever you go to busy places, like a train station or a bus stop. There are

     often thieves there!

◆ There are some souvenirs (纪念品) in most places of interest. Leave room in your bag for them.

◆ There are some things at a discount (打折的) for students in most countries, so if you have one, take your

     student card with you in order to save your money.

◆ Bus tours often stop at expensive shops along the way. You'd better not buy souvenirs there. Instead, you

     can buy them in local shops at a lower price.

◆ Remember to take your passport with you if you travel abroad. Whatever you do, don't lose it! Most

     importantly, always remember to have fun-that's what holidays are for!

Answer the following questions.

1. What is a good way to keep away from being bored while you are on a train or a bus tour?

2. What should you take with you if you go to Hainan Island for a trip during your summer holidays?

3. Why must you always pay attention to your things when you are at some busy places?

4. According to the passage, if you are a student and want to buy some souvenirs at a discount when you are

    traveling, what should you show to the shop assistants?

5. What is the most important thing for your holidays?

—Last week American doctors ______ his foot.

—They say Liu Xiang may run ______ after the operation. [ ]

A. operated on;  even faster

B. operation on;  even fast

C. operated to;  much faster

D. operated;   more faster

风湿病(rheumatism)

一患者因大吐血而出现体虚欲脱，大汗淋漓，脉微欲绝的症状。若患者伴有口渴面赤，血色鲜红，粘稠量多，宜配伍的药物是：（）

A.沙参

B.天门冬

C.黄芩

D.黄连

E.胡黄连

2007年12月21日，中国人民银行调整人民币存款基准利率，其中3年期整存整取利率为5.40%，这个利率不属于( )。

A．官方利率

B．实际利率

C．固定利率

D．长期利率