问题 多项选择题

关于久期,下列说法正确的有______。

A.是债券期限的加权平均数

B.一般情况下,债券的到期期限总是大于久期

C.久期与息票利率呈相反的关系

D.久期与到期收益率之间呈相反的关系

答案

参考答案:A,B,C,D

解析: 本题是对久期基本概念的考查。
久期又被称之为“持期”。这一概念最早来自麦考莱对债券平均到期期限的研究,他认为把各期现金流作为权数对债券的期限进行加权平均,可以更好地把握债券的期限性质,所以提出了“麦考莱久期”的概念。久期表示的就是按照现值计算,投资者能够收回投资债券本金的时间(用年表示),也就是债券期限的加权平均数,其权数是每年的债券债息或本金的现值占当前市价的比重。本题的最佳答案是ABCD选项。

阅读理解

阅读理解。

     Car sharing is another way to drive green which is gaining in popularity, especially in urban areas. People

who may not drive every day but still want a car to run errands (差事) or drive on weekends benefit most

from car sharing. Car sharing is usually run by a service like Zipcar, though there are non-profit (非营利的)

and informal car sharing services. Members pay a monthly fee and have access to an entire fleet of cars when

they need one. The cars are parked in fixed spots around the city, so members only need to make a reservation,

and then go to the pickup spot.

     Car sharing has major environmental benefits because it reduces the number of cars on the road. Members

don't drive just because they are in a car. They plan trips, and if they don't need a car, they don't use one. Still,

a car is available to them if they need to make a big trip to the grocery store, pick someone up at the airport or

if they want to go to the beach for the day. Members also benefit by having access to a car without any of the

headaches of ownership. They usually don't have to pay for the gas, insurance or maintenance (保养), and the

monthly membership fee is less than a typical car payment. So if you really want to go green but aren't ready to

totally give up a car yet, car sharing may be the way to go.

     If you still need to get around, but want to go even greener than sharing a car, share a bus!

1. The author intends to tell us that car sharing _____.

A. has become the most popular way to go to work

B. has become the best way to cut living costs

C. is becoming more and more popular in cities

D. is becoming popular both in urban and rural (乡村的) areas

2. We can learn from the passage that _____.

A. Zipcar can't help you if you are running urgent errands

B. Zipcar, different from other services, is aimed at green driving with no profit

C. Zipcar is a company supplying car sharing services for a monthly payment

D. Zipcar is a company providing formal car sharing free

3. The second paragraph mainly tells us _____.

A. why people will share a car

B. why car sharing benefits the environment

C. why car sharing is cheaper than owning a car

D. why a car is available to members

4. Which of the following is NOT mentioned in the passage?

A. Car sharing has become a new trend (趋势).

B. Car sharing can save you the headaches of ownership.

C. Bus sharing is even greener than car sharing.

D. Zipcar is the largest company offering car sharing services.

名词解释